Black people don't "own" rap in the sense that you don't and shouldn't need a black card to be a rapper.
Also, Iggy's career is where Azealia's should be right now for a lot of reasons...aaaaand most of those reasons have to do with Azealia's stank-ass, self-sabotaging attitude. Can't blame Iggy for her success. Yeah, she's a pretty white female rapper and that alone carries novelty, but it ain't THAT easy. Look at all the other pretty white female rappers trying to make it where Iggy is and failing. The end of the day fact is, Iggy hustled to get where she is. And Azealia hustled her foul-ass, homophobic, hateful mouth on Twitter to get where she is (not-a-damn-where).
That's tea.