Frognog
I know exactly what you're talking about.
I don't know the areas you're referring to, but I've lived both in affluent and extremely poor and racially diverse, and very 'middle-classed' areas of London, and have never felt the need to scurry around in fear once.*
I suspect other contributors to this thread have wildly different experiences growing up. Perhaps they come from areas which were prodominantly 'mono-cultured' and have since seen the influx of EU and non-EU residents.
To me, that wouldn't make a damn of difference. All I would be concerned with is is crime, house values and peace and quiet.
There are some who immediately associate the social evils with certain cultures. I am not so sure of this, having had the 'pleasure' of doing a tour of duty around the less salubrious parts of Glasgow back when I worked for a high street bank.
I associate bad neighbourhoods with high unemployment and a lack of opportunities...rather than anything else.
But then, that would complicate matters...so, perhaps we should keep it simple.
(*and this includes the famous Aylesbury Estate in Walworth, a place so rough it was used as location shooting in The Bill...it was the Jasmine Allen estate in the show).