I know what they OP is saying, the stereotypical accent is horrible. I hear all sorts of people saying it, it's so chavvy. People just try and talk like that to act 'black' and they tend to be wannabe gangstas. Half the time i hear white people using the stereotypical london black accent, just coz they think it's cool. People just model themselves of gangstas of things like kidulthood and try and talk like that and think things like drugs and guns are 'cool'. It's ok when you hear the odd few black people ( whose accent it actually is) speaking like that, but when you hear all sorts of chavs copying, it just really makes you cringe.