I don't "hate" any physical part of London, what I hate is the way that the social environment has changed in some parts, compared to when I was growing up in the late 60s and 70s.
Although there was never, IMHO, a "Golden Age" of social integration, class cleavages are a lot stronger now, compared to then, and that's mostly to do with property ownership. Thatcher (to paraphrase) said "only losers take the bus", whereas nowadays the trope seems to be "only losers live in social housing", and areas that were reasonably socially integrated 30-40 years ago now have dividing lines marked out starkly by tenure type.
I had mates whose parents lived in the old "2 up 2 down" terraces around Latchmere Rd in Battersea, working class council renters all. Now most of those homes and others of similar type are privately-owned, leaving only the low rises and high rises as "social housing stock" and those who were "Battersea born and bred" are gone, out to the suburbs or beyond, priced out. This appears to have been a pattern that has repeated almost everywhere in London, anywhere the "gentrification" virus has touched.
It's utterly depressing to me that if I walk along any of the streets in SW London that I grew up around, what were fairly integrated working-class/lower middle class neighbourhoods are now predominantly the domain of the "professional" classes. That, to me, is why parts of places like Clapham, Balham and Battersea seem so alien and so full of people whose ideals and ideas I want no part of, and not because something has happened to the places in and of themselves.
Rant over.
