The only people who care about that stuff are just very insecure, usually social climbers though janos. Normal people don't give a fuck. The people who care are the ones who are trying to decode what behaviours the people "above them" display, and then ape them.
And I think that milly your post demonstrtaes quite well the difficulty, in that the obliteration of regional accents and an obsession with house size and area, isn't sometihng I associate with anyone I know. People who think like that might be twats, frankly, but i don't think it is a "middle class thing". IYSWIM.
So when you say "I don't like middle class standards" I have no idea, it wouldn't even have crossed my mind that you were talking about obliterating regional accents. I have never even heard that as a class thing before.
I think we need to say who and what we are talking about, explicitly, and then talk about it 
Oh and saf the thing about keeping people content with their lot by telling them they've "arrived" - I have read that somewhere before - how "we're all middle class now" is a trick.