This is correct.
However, while no art form should need a particular group of people to legitimize it for said art form to be considered worthy, Hip-Hop/Rap to this day hasn't been respected as a real artistic form of expression and music by White America since its inception, despite it being the most influential form of music to date.
But, ever since Iggy and Macklemore got involved, not only is rap suddenly getting more respect from White America, but those two artists are placed on a pedestal as the absolute best of the genre. The same thing happens with Eminem. The difference is, at least Eminem and Macklemore have publicly acknowledged that they don't consider themselves that way, and Eminem has publicly stated that people only see him in that light because of his race. Iggy has done no such thing.
You see nothing wrong with this?
Yeah I'm not sure what this means, Hip Hop has been popular with white america since just about the beginning, it never would have become financially viable if this were not the case.
Unless you are strictly talking about bullshit like the grammys, rap has receives just as much 'respect'(which in terms of popular music is properly measured in dollars) as any other form of pop music, and there are plenty of other genres that are completely ignored by the grammys as well. Especially the main other 'aggressive' music genre, Metal.
When have the old guys in charge of the music institutions ever actually treated any popular music with respect as a valid artform? Going back to the beatles or Elvis it's always been a grudging 'well you made a lot of money, but we don't get it' recognition.