What about the possibility that they have nothing against black people, but still think that rap is a stupid type of "music"?
I'm no expert, (note the qualifier, followed by another one) but from what I've heard, rap is mostly garbage. Some gangsta talkin bout smackin down his bitches and gettin down wit his homies and poppin caps in asses and how difficult life really can be when you're a pimp. Stupid. And there's no music to it either.
If it doesn't have drums and at least 1 guitar, it's not music.
For me it's those 2 things combined. I actually don't mind Bodycount, I know it's old school and it carries on with the same bullshit, but at least it came with some decent riffs.