both, when privileged white people attempt to get into a genre about expressing opinions and sharing troubles about having next to nothing and being oppressed and beaten by racist police, and all they talk about is how cool they are for smoking weed or how nice their shoes are it takes the sellout level of the genre to a whole new level. forget how sold out rap has been since biggie and tupac, the worst artists for the art form have been vanilla ice, that little douche that sang I love college and these white little canadian boys that think smoking weed is a culture.
Also the music sucks if you actually listen to it. I don't give a shit about your shoes or if you're the last one left. It's not entertaining. Repetitive beats and sampling the same shit for the entire song is about as boring as watching paint dry. Yeah you can have a cool sounding beat but if thats all i hear for 2 minutes straight i want to blow my brains out.
and yes there are shitty black rappers as well, 99% of what is on MTV and the radio actually.
Thats not to say that there is no good rap and no good rappers, Common Market, Immortal Technique, blu and exile, the Roots etc have poetically stimulating music where the beat serves secondary to the spoken word. When I listen to rap I don't want to hear a 12 year old's word repertoire coming out of a skinny white 16-24 year old with clothes too big for his body and a punk bitch attitude, I want to hear something that makes me go "wow that sounds good and you gave me something to think about" or "I never thought about that issue from the point of view you're giving to me" or maybe just "damn I cant believe you thought of that"