Wouldn't be friends with ... AIBU to judge her for this?

she is just young with no life experience. Lots of us were daft at 23.

She's a snob who will use you as her yard stick . People like her around themselves with people they think are below them to big themselves up . She sounds Narcissistic.

Plenty of people are able to get drunk without making nasty generalisations about groups of people, those ridiculous views are her real views, in vino veritas and all that

Op I'd go to the brunch. And I say this as someone she wouldn't want to be friends with (state school and fat).

I'd judge her on how she treats people and id probably make a joke at brunch about us she going to ditch me if I eat too much dessert. Is she incredibly embarrassed it came out sounding like that or does she double down? If the waitress is overweight is she rider than to the slim one? Did she mean that she's just never gelled with someone obese because of their comparative ways to have fun? Id probably struggle to bind with someone who was focused on how .any calories in this and how many hours at the gym they've done. I wouldn't swear off all fit people but I Def have no gym obsessed friends.

Still awaiting middle age and menopause though… ;) was skinny for years and now all those things down the line I’m not.

you also seem to be getting quite defensive OP, you described someone who basically sounds like an ignorant, ill informed, narrow minded judgemental cunt and then take umbrage when people have pointed that out. Bear in mind all we have to go on is your comments about her, we don’t know her, so we’ve formed views on what you’ve said.

Some of the most intelligent and inspiring people I've ever known have been overweight
It's not always food , could be meds or thyroid problems or any illness ( which then stops being able to exercise) she isn't thinking outside the box of her own beautiful thin friends. God forbid one of those put on a pound or become pregnant, she may implode.
She'd hate me..lol

I think it sounds like a drunken chatter - there's no way to know if she meant to say that / you heard it right - if you were all quite drunk there's a huge possibility that it's been totally misunderstood or misconstrued.

If you like her and get along, I'd still go to brunch and spend time with her! Drunk people waffle all sorts of nonsense.

23! Ha! Let’s see how this size 6 is maintained when/if pregnancy/middle age/menopause hit! Daft bint.

Do you think an intelligent person would decide they couldn't be friends with 94% of people?
Do you think an intelligent person couldn't engage in conversation about the privelege and advantage of private education without drunken shrieks of 'jealousy'?
Do you think an intelligent person thinks body size is a personality trait?

I'd say probably drunken chat and I'd continue to see her if meeting up was fun. If you don't like her or enjoy her company that's fine - don't see her. But if you do then don't terminate the connection on the basis of a drunken convo. There's no value in virtue signalling (except on here) and you may find if you eliminate acquaintances because you think you should then you may end up a bit lonely.

A case of Birds of a feather then obviously. They deserve each other.
Perhaps real life will catch up with them one day and when they need a bit of kindness and empathy shown to them it will be lacking.

I wouldn't think twice about binning this one off because when it comes to friends, I choose quality over quantity.

If I had to think twice about it, I'd look at myself and wonder why I felt I needed to keep her around.

If the answer was because I felt I didn't have enough friends, I'd do something about that instead.

I also suspect that she doesn’t really see that her privilege has taken her that far and isn’t friends with people who have been in a less privileged position because it reminds her of this

I think you both sound pretty judgey tbh; saying you wouldn’t be friends with people who use social media a lot.
It sounds like you’re both crap company so the brunch will be dull. Who the hell spends a night out discussing groups of people they wouldn’t be friends with?

How old is she OP? This is me potentially being judgemental but I find people with less life experience can be more judgemental

I think it's just silly drunken rambling tbh and if the friendship is otherwise rewarding I'd just ignore it and move on. My friends aren't all carbon copies of me.

She sounds incredibly judgemental! Ruling out 93% of the population based on the school their parents chose and that's just for a start...

Not only is she judgemental but she also sounds rather stupid! For someone to say "I can't be friends with fat people, I can't be friends with people from state schools"? I mean WTF? It's just incredibly dumb!! Shows that an expensive education can't buy intelligence or empathy.
I'd tolerate her but I'd never see her in the same way again and wouldn't want to be close friends.

She’d hate me, a state comp educated fatty with a good degree and job.

she sounds vile. How old is she that where someone went to school even comes up in conversations? 12? I can’t remember the last time someone introduced themselves to me, or me to them, outlining my education status.

she sounds not only judgmental but ignorant and ill informed with her comments on privilege also.