This attitude is probably true. My DCs went to a school where most people were far posher and richer than us (bankers, law firm partners etc.) but we are in a lower social bracket. All the parents were polite and superficially friendly, but however much we tried and were nice, we never fitted in or were invited to events. They were all white and we are mixed race. They were pretty much all Guardian reading liberals, but in my view didn’t live the values that they undoubtedly thought they had. On paper we should have been the right sort of people (we visited Cornwall, went skiing and listened to radio 4 ☺️, plus had professional jobs) but we still weren’t.
However although we are mixed race (Asian, Black and White) we didn’t fit in with the Asian and Black crowds. as I think we don’t know enough about the cultures. Again, nice people but we couldnt get close. It was very hard actually.
My work place is a mixture of races and social strata, and I have many friends there (so I don’t think it’s me! ☺️). Ditto my husband’s place of work.
I found the playground/school events etc difficult but I only gave up trying seven years of the nine at primary school. And if anyone thinks cliques/schoolyard politics aren’t a thing, they haven’t experienced it.
As a family we genuinely don’t care about race or class - I am a middle class Asian by parents’ profession and my husband is from a very poor and what he would call a working class background. But we are friendly with everyone.
Because of our experiences, I think the view expressed in this thread that birds of a feather flock together is quite sad but true. If you cant find similar ‘birds’ though, I’m not sure whom we are meant to flock with.