Actually, it's interesting that you say that, because the part I edited out clarified that issue. That is, it explained my belief that there are probably, AT LEAST, two black communities. Let's call them the black under class and the black upper class.
The kids from the underclass don't worry about being a 'nerd' or popular or whatever. As I said, I think they have far more pressing concerns. They worry about not setting off some gang banger by stepping on his shoe. Or having said gang banger mistake them for cross town rivals. Or having a police officer mistake their wallets for guns. You get the idea.
Whereas kids from the black upper class are a little different, and this is the part where I have to be careful. I think kids in the black upper class think that being 'cool' is being from the black under class. So they go out and do their best imitation of kids from the black underclass. Only they don't know much about the black underclass, so it comes off cartoonish. Only slightly less cartoonish than when white kids do it.
Since our 'interface' to black America is really the black upper class, we get the impression that acting cool is more important than being smart. That doesn't necessarily mean that kids in the black under class believe that. My suspicion is that we don't really know what those kids believe, and we'd be surprised to find just how pragmatic their beliefs are. I think it was Dr. Dre who said he didn't know any rappers who got rich selling music to the 'black under class'. I'm paraphrasing there, but again, you get his point.