Like Ive said before, rap stems from the streets. A minority fuelled with anger, and scuccombing to supression. ignored by those above them in life, generally white people.
I have no real problem with those lyrics, because, as a white person, I know that they are just a song, and nothing more. Also, it appears nowadays people accept that the white man was the most racist of all, and their is a viable arguement, that, well we inturn deserve some critisism. Now if they made a video and actually started doing stuff racist, then that would be different.
I'll have u know white people have spat racist lyrics before eg. Bawston Strangla and even Eminem, which the Source revealed last year.