I was brought up on a council estate and, in all honesty, I loved it. They are the best memories of my childhood.
Where I lived, it certainly wasn't a "dirty sink estate", but of course there are some that are just that.
Problem is, I went back there recently and it was nothing like I remembered. As someone else said, this one had gone massively downhill too. It made me feel quite sad, really.
Anyway, my point is, there are decent estates and not so decent estates.
I don't think it's fair to generalise and think that every estate is going to be full of "chavs". Some people have lived there all their lives and are respectable, decent folk.
To be honest, some of the estates near to where I live are nicer than half of the residential streets in the town!