To think the hilarity just wasn’t necessary?

Maybe they’re able to think about history while also being in a room with other people?

Well, apart from being embarrassed that some of your family members are so clueless and have apparently never wished to think about anything, no reason for you to feel bad.
You might want to talk to your daughter about it, though.
Maybe next time your sister asks you for a favor, you can haughtily tell her you'll relfect on it.

I assume they were just mocking the phase. Not the actual activity of thinking. It's just a pompous sounding phrase and then coming from a 9 year olds mouth sounds even more funny.

"Mums just having a quiet 5 minutes" wouldn't have led to any hilarity.

What a silly post. It's not an inability to hold a thought, it's that thoughts naturally tend to fade once you move on to talking about something else. You start to get interested in that subject instead. If you don't know that, you don't understand human nature. I can't help you with that.

Repeat; the shallowness comment was in reference to people who think stopping to reflect is weird and laughable.
Clearly, your comprehension is indeed lacking and you play silly gotcha! games to try to win an argument. You use personal attacks as well. I presume that's because you have no on point refutation and you haven't the guts or humility to admit it.
Perhaps you should take a moment to get the stick out which is crammed firmly up your ass? Just a suggestion.

Well, apart from being embarrassed that some of your family members are so clueless and have apparently never wished to think about anything, no reason for you to feel bad.
You might want to talk to your daughter about it, though.
Maybe next time your sister asks you for a favor, you can haughtily tell her you'll relfect on it.

Was at my grandmas earlier with DD (9). My sister, her husband and their kids were there too. We were talking about history and I was absolutely fascinated by it (I love history, especially British history) and at one point I took myself outside into the garden to have a few minutes of thinking and reflection on what we’d been talking about.
DD came out to ask what I was doing and I said “just having a few minutes to reflect on what we’ve been chatting about”.

She went back inside and then I heard howls of laughter coming from the living room. DD had told them what I’d said and they were all in stitches over it. It really ruined my thoughts and I tried to get the topic back up and running but sister kept saying everyone was still reflecting - cue more hilarity.

was what I said really that bloody funny?? Pissed off but also a bit embarrassed 😞

Then the issue is your (and her) inability to hold a thought in your head for any period of time. That doesn’t make people who can ‘shallow’.

You said Nope. The problem is that many people are shallow and don't reflect on issues enough, so they assume other, more thoughtful people are strange to do so in response to my comment about the OP’s behaviour. Specifically, leaving a social situation to ‘reflect’ being odd and not indicative of ‘cleverness’. You did not say people are shallow if they ridicule others for being thoughtful and reflective.

My comprehension isn’t the issue, here. I continue to find you laughable. Your responses on this thread are rather manic. Perhaps take a breath. Or a moment to reflect.

There's a lot of autistic traits going on here; a deep, intense interest in a niche subject, that long exceeds other people's ability to maintain conversation on the theme, a need for quiet space to process and ruminate about the experience, an inability to read other peoples' experience of the situation and taking it all more seriously than others.

DS has a deep and lasting interest in weaponry and ammunition of WW2 that has lasted years and there has to be a balance of some space to express himself, but also it's not fair on others for him to regularly steer the conversation to it or to talk about it for his full attention span (which can be a verrry long time).

We all have quirks and eccentricities in our family. Some at a ND diagnosable level, some not. We laugh at each other and ourselves. Humour lightens life up. It makes it easier to manage.

I like a "buffer" at transition points. It drives the DCs round the bend that when I've finished driving, if there's no urgency, I like to sit in the car, finish a song, check my phone. This is a habit that pre-dates smart phones and I did 20+ years ago from the start of driving so it's a me thing, not a phone thing. It's not a dissimilar need for DS to have to return to the hotel room on holiday for a couple of hours between activities. But I'm aware of it and can be irreverent about it. Sometimes finding the humour stops us exploding with frustration at ourselves or others- it's not automatically mean or bullying.

At the least it's worth recognising when your behaviour differs from the norm and why that is. It doesn't mean its wrong and if it's something that can be interpreted as rudeness, if you can explain your needs, that helps people understand your intentions. (e.g. there's a difference in understanding that DS is leaving the table because he's reached his social limit and him leaving the table because he's impatient to continue a game)

The moment when it was fresh in her mind would be lost. This happens to me as well. Later on, my enthusiasm about what was discussed can tend to wane. I may forget the details of what was said.

I was saying people are shallow if they ridicule others for being thoughtful and reflective.
So laugh at yourself for your lack of comprehension.

Count the number of posts here. Then count my responses. Your math is way off.
You obviously don't know what projection is. Look it up.

I've explained whyyyyyy, several times, as have several others.

Meaning you can't explain why it's inappropriate.
But wait, you are bowing out of a conversation? How rude!

Because it was inappropriate to the social gathering. But you have no interest in actually trying to understand, you just want an argument so I'm out.

It is when she tried bringing the conversation back on what she wanted !! She was rude. As has been established.

Nah I’m not - I’m frequently wrong!

is there a reason you’ve replied to practically everyone in this thread? Perhaps you’re the one who is projecting, not me.

You sound like you're projecting, especially given you personally attacked a person just for having an opinion you disagree with. Let me guess; you're always right?

Were you also a bully at school?

Is it rude to get up to use the toilet? To check on dinner in the oven? To attend to a child? To check your phone messages? No?
Then we have established it is only "rude" if the object is to avoid an unpleasant subject and go have a think. Therefore, it's not rude.

People have not explained why it is laughable to go off and reflect on the subject.
This is the question the OP asked about, not whether she was rude to try to change the subject.

It's been explained multiple times.

The sister kept trying to change the conversation, then when she succeeded OP left the room to continue thinking about the previous topic rather than contributing to the group. And then came back in and tried to change the topic back to what she wanted to talk about even though the group as a whole had clearly exhausted their interest in it.

Group gatherings involve conversational give and take, it's rude not to join in or to try to monopolise the conversation - or repeatedly steer it to something you find much more interesting than everyone else.

It's a time and place thing - it was neither the time nor the place.

The moment when it was fresh in her mind would be lost. This happens to me as well. Later on, my enthusiasm about what was discussed can tend to wane. I may forget the details of what was said.

I was saying people are shallow if they ridicule others for being thoughtful and reflective.
So laugh at yourself for your lack of comprehension.