I think the big issue with shitty, degenerate negroid music is that it's pushed very hard. There's plenty of songs by Whites that have abhorrent messages/lyrics but for the most part, they're not meant to actually inspire people to commit the acts described (in fact often the opposite), and the few that are are widely feared and ostracized by society (I don't think Mayhem is mainstream anywhere, nor is it supposed to be) whereas a lot of rap not only glorifies and revels in criminality but also is incredibly popular and mainstream.