Yeah, I'm fairly certain people hate Kanye because he's an egomaniacal douche, not because he's black. Also, Macklemore IS pretty groundbreaking in the mainstream because mainstream rap tends to be little more than brag tracks and party songs. Is he groundbreaking in general? No, but he's still more creative than most of the stuff that hits the mainstream.
Tupac, Biggie, Eminem (who makes the opposite of brag tracks because he's always said he just wants to be a rapper that that is all he is), Atmosphere (depending on how we define mainstream), Hollywood Undead (depending on how you feel about some of their harder hitting tracks and the fact they aren't 'pure' hip hop/rap)
Macklemore isn't groundbreaking in any way. He's just considered that cause he thought he was gay cause he could draw. And the insinuation that all modern rap is about 'fucking hoes' and 'getting da benjamins' is ignoring a good part of rap. And racist besides.
While Macklemore is getting credit, people like Azealia Banks are being blatantly ignored even though she's a bisexual female who raps better than Macklemore. And yes, I am aware of the slur controversy with Azealia but that isn't the point.