OP, thanks for starting this thread, it should provoke a lot of debate. I am in my mid-sixties now. I lived on a council estate with my nan and mum, who worked in various retail and cleaning jobs to provide for us. The estate we lived on certainly had its fair share of problems and parts of it were considered to be 'rough'.
Back then being 'working class' and 'proud' was a bit like cleaning your windows regularly, having clean curtains which hung neatly at the windows, nicely kept gardens, as opposed to old cars up on bricks in the front garden, torn sloppy curtians and bonfires. My mum...nan had passed away by then..was certainly 'proud' when I went off to do nurse training.
But now I think that that sentiment has changed somewhat. So a skilled tradesman is highly likely to be earning about 3 times as much as, say, a teacher who has had a university education and likely to have had a middle-class upbringing. So our hypothetical tradesman is 'working class and proud' because he can afford a nice house in a posh area, a fast car, designer clothes and the like.
When I married, I was propelled into the middle-class diaspora. OH comes from a family of professionals, but I found that lifestyle so cold. compared to my previous one. There was no joking, no listening to Radio 1 or 2, but if you did listen, in no way must you disclose that heinous sin to ANYONE🙀
I remember Christmas mornings as a teenager, with the neighbours coming round for sherry, mince pies, and snowballs. Everyone was friendly and looked out for each other. I really miss that.😥