1) whats the big deal if they do, aside from it not being your taste.
2) if you're not imitating rap stars you're imitating white americans/europeans, pretending its somehow more culturally relevant to be listening to beethoven, playing golf on a sunday, and instead of liking someone with a gold tooth, liking someone who hasnt seen a barber (or a shower) in years. all part of being integrated into whatever culture you're in or trying to emulate.
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I agree with you partly on point 1, but there's taking part in a certain culture & then ther's over doing so that your exaggerating the idea more than it is & making yourself & those around you look like idiots, i.e nothing wrong with wearing the clothing, the music ( myself a HUGE 2pac fan ) but walking around saying 'waaaggwaaan bluuud', 'dem hoes', starting trouble that you rely on others to finish deserves you nothing but a kick in the head.
Point 2 is some of the most sensible logic i've ever heard, although there's nothing wrong with doing those activities if you genuinely enjoy them, but i understand what your saying. We all come accross asian people who seem to think that if they act like upper/middle class white people, i.e using complex words when not needed, maintaining a proffessional facarde when describing simple ideas, change their names to english ones etc, that some how they will be regonised as upper/middle class white, they too make themselves look just as stupid as their sagging pants, cheap gold wearing, foul mouthed, dope smoking paki counterparts.