To not like how this makes me feel?

[FGSholdthedoor]

Not a huge thing or the biggest problem ever but something I'm a little (probably unreasonably) put off by.

So a little bit of background, me and my parents don't have the greatest relationship due to multiple things that have happened, my DM is a bit very difficult sometimes and it's all a little strained. I visit them with DS but due to all the issues we've never had them babysit him or sleep over etc. So it's all a bit hard.

My DP(arents) are quite young, they had me young and I had my DC young so they really do not look old enough to be grandparents.
Up until a few years ago people would think me and my DM were sisters which I really didn't mind and actually enjoyed as I know it made my DM feel great about herself.
But now they're DGPs people often think they're my DSs parents and I can't help but really not like it and I'm not sure if I should be feeling like this

And it doesn't help the fact that when they get mistaken for DSs parents they revel in it (which again I understand why but I can't help but feel put off).
I think in the past they didn't even bother correcting someone.
It's probably due to my own insecurities and issues but I then question wether people assume they'd do a better job than me/are better equipped to be parents which I know probably sounds even sillier.

AIBU to feel like this about something so innocent?

People really mean no harm. How are they to know? So please don't take it as a slight on your parenting. It's nothing to do with that.

It’s their attitude that is bothering you - a lack of boundaries, a lack of acknowledgement. I get it.

I think that's kind of what it is @AtrociousCircumstance

I think it grinds on me a bit that I know they absolutely love it and I know they are probably capable of "going along with it" if they were out and about with DS on their own...which doesn't sit well with me.

Yes it’s not respectful of your feelings. It’s not a problem if they feel nice because of it, and they have no control over it happening, but the way they respond to it is key.

I bet they have a long history of being self-absorbed and not respecting your boundaries that well?

My DM can be a bit self absorbed but she can also be really thoughtful... DF not so much he's quite ok.

But I know they were considering having more children around the time I fell pregnant with DS (before I announced my pregnancy). My DM was very broody and my DF even asked me if it would be an issue if they were to get pregnant as obviously it would mean (if they succeeded) that my DC and my new sibling would be quite similar in age.
I told them to go for it if they wanted to as it was totally their decision and their happiness I would be happy for them no matter what as long as they were happy. I know they considered it but decided against it in the end.