It's just those particular cultures. By culture I do not mean nationalities.
I meant references and subtexts.
Primarily based on a group of people's exposure to certain medias and their tastes.
Whether it's fandom, political stuff, religious beliefs, academic subjects, lifestyles, even sexualities...
They have their own memes and would collectively laugh at them, their own ways of seeing and referencing stuff that 'outsiders' wouldn't get.
For some reason, I do not vibe with a lot of them.
It's not the autism.
It's the choices I get (not a lot), the choices I took (again, not a lot), and what I have or do not have to begin with (in which I don't know a lot with what to do with it).