In theory, yes. I'm upper middle class in theory, I speak rp, I'm intelligent, degree educated, with a gifted child who also speaks 'posh' if not quite my rp. I also live on a council estate, and short of the money for a much bigger detached house, of which there aren't any in my chav area, I have no intentions of moving. I like it, and my neighbours and community.
I've lost count of how many times people ask wanker questions or make stupid comments such as 'and are you safe there?' 'What a shame for you' 'how did you end up there?'.
Still, I find it is unfailingly the insecure, social climbing, one generation removed from working class, socially inept and unable to think beyond their own rigid circle lower middle classes that act this way. People with actual class, whether that be working, upper, or middle, tend not to give a fuck.
Re EU voting. It's not intelligence or information. It's because generally speaking, the benefits of the EU apply to the better off, while the negatives only effect those at the bottom.
And fwiw one of the most razor sharp and analytical minds I've ever met, not to mention the first person I'd trust my child to, belongs to someone the worthies of mumsnet would judge to fuck. And yet she could give them all some low quality fashion hunters, a waitrose golden customer trophy, some tweed judgy pants and a tin of farrow & ball paint and still beat them hands down for real class.