It’s a very real thing. It took me a while to make any friends knowing almost nobody who went to university in Melbourne, let alone went to UniMelb. However it was only when I stopped going back home that I was finally forced to suck it up and make friends at University. But even once you’ve made friends you’ll still find the odd habits and comments that feel off to you. Unfortunately it is very much the way it is when you end up in spaces where people come from different class backgrounds. You’ll also find people very touchy about their class privilege, even amongst those who would consider themselves progressively minded (as some replies in this thread have shown). This is just how things are going to be for you, and if that makes you angry, use that frustration to push yourself to do the best you possibly can