To respond this way to sister criticising my diet?

So bragging about being taller and healthier are ok but not about being wealthier?
why?
such a British attitude
In fact the OP can take credit for her money unlike her height

Haha...I can see why you said it.

But the thing about being a multimillionaire made me laugh.

I guess you've saved loads of money by not buying meat? Otherwise it doesn't have much to do with your vegetarianism surely?

I was going to agree that your sister was wrong to comment on your diet until I saw your incredibly nasty comment about being a multimillionaire and her relying on your parents for money. You were very very spiteful to brag about year wealth and rub your sister’s nose in it. I would have walked out too, but would probably have poured my drink over your head before I did so.

They sound like the sisters in Cinderella.

I definitely think the money comment was justified if the OP’s sister has been making barbed comments about brain development for 25 years.

I think you did the right thing OP. If this has happened multiple times over 25 years then you were going to reach your limit at some point. And I do think the millionaire comment is perfectly justified if she had been making digs about vegetarianism having some sort of impact on mental acuity. And making snide remarks about your partner? She sounds thoroughly unpleasant.

She will think twice before making comments in the future.

You don’t ”have to” do anything like OP did at all actually.

B12 deficiency can impact communication skills. A test wouldn't hurt.

You had a point up until you mentioned money so ultimately you’ve made yourself look a right tit. Embarrassed for you

You actually don’t “have” to; you can always just ignore comments.

Unhinged? Oh get over yourself. It was slightly snarky at best and tbh the woman had it coming. Sometimes when reasonable responses aren’t landing you have to try a different tack

Well it suggests there isn’t some lack of intellectual development or energy levels due to her diet

I’m afraid I slightly agree with this last sentence.

I suspect it comes across and it’s what the sister has been needling at.

Unhinged is what you get when you have bashed your brains out on a ( metaphorical) brick wall for years. of course OP went mad. People go mad when tortured. The drip drip drip. Don’t blame the OP for being human .

Which could have been simply telling the sister to seriously stop questioning op’s choices or she might stop contact.

What op said was unhinged, and says a lot about what she really thinks.

This. If she’s been making barbed comments and picking at your lifestyle for years I completely understand why you said it all - to make a point. Slightly ducking commenting on the funds but as she’s been constantly picking apart your lifestyle choices it was your equivalent response to her.

People who constantly criticise or ‘banter’ usually can’t take reciprocal responses. I had a friend who spent years making comments she thought were funny about my sex life (actually I was going through a marital split due to his infidelity so they were actually really hurtful). One day I’d had enough and made a similar barb back at her and she actually started screaming at me in public. If they can’t take the ‘bantz’ they shouldn’t give it out.

I bet she behaves like the biggest victim bullied by her very meanest of mean sister.

You were nasty. It was unnecessary. I can see that her comments are irritating but you could have just said something like "Oh, not this again. I’ve told you all this loads of times before."

But it sounds like that's exactly the sort of thing the OP has been saying. For a long time. And it hasn't made any difference, it hasn't stopped the sister having digs. So it was time to try a different approach.

The money comment was bitchy and unnecessary. Yabvu for that part.

I'm not sure that was the right way to respond (what has being taller or a millionaire got to do with your diet?) but she is unreasonable to keep bringing the subject up.

I would say to both of you never be too smug: either of you could find you are suffering from something any day.

The “I’m in better shape than you” boasts can go awfully wrong. I’ve seen this first hand - most dramatically with a woman who was lording it over a overweight friend that she was so fit and healthy she needed to plan for a long retirement. She more or less said at a dinner party that our larger friend was “ lucky” ( tinkly laugh 🙄) that her weight meant she probably wouldn’t have lots of care home fees.

I think it was the following week that the health fiend was diagnosed with advanced breast cancer.

You shouldn't have no but it sounds like typical stupid sibling stuff.

Now she knows though, if she didn't before.

Well it sounds like you wanted to both hurt her and boast about your circumstances - well done goal achieved I guess!

Yes! She needs to shut up, once is enough.

PS: Are you really a multimillionaire or was that hyperbole?

Good on you. She’s been poking away at you for years and it sounds like you’ve finally had enough. Yes what you said was mean but she needs to learn this is what happens if you keep harping on at people. She shouldn’t dish it out if she can’t take it.

While you may have been deemed unkind, there is something going on here.
Sibling relationships are complicated.
She already knows you are taller, in good shape, and have done well in life so your diet is the last frontier - the one thing she can needle you about.
I think she’s been out of order for a long time.
She will have the hump.
But maybe it will stop her going it again.
And…. you could have said far worse!!!