Honestly, there's nothing hotter than a black girl that is soft spoken, timid, takes good care about her looks and appereance, dresses nicely, is polite. Basically a black girl that rejects her own in every way possible and tries to act white.
As for the OP. They peer pressure each other to talk and act that way because of their own feelings of inferiority, since if they don't it they start accusing each other of acting white and being traitors to their race. They are dumb and appeal to the lowest common denominator. Crabs in a bucket kind of thing. The cringiest thing is when other races try to talk that way, I've seen asians do it, trying to fit in. I've seen whites do it too, but it's usually satire, making fun of them.