I live in North London, work in South East London and have lived in East London and South London.
Funniest thing I ever saw was a Muslim shop keeper in Leytonstone (about 2miles from East Ham) being fairly brisk with a couple of Eastern European kids. As soon as they left he turned to me and said, "Bloody immigrants! They come over here, they've got no money and they can't even be bothered to learn the language!"
Which part of London? SAy, heard the joke abouthte Irish guy that gets tossed out of a pub in London into the gutter outside. He gets up and starts cussing in a rich Brogue. Two Sikhs walk by, one mumbles to the other "Bluidy furriners!"