Whites enslaved blacks and Nazis killed whomever they felt like hating that week. Blacks also sold rival tribesmen (those they didn't slaughter) into slavery in the past and are currently slaughtering each other in places like the Sudan in ways just as cruel as those dreamed up by some Nazi camp commandant. White slavery has been a booming business in the Arab world for centuries. I would think it obvious that the color of one's skin is immaterial to the evil one can commit.
Attempting a "reversal" like this would only be controversial if you were ignorant of reality.
Since most people are, you might just have a critical hit on your hands.