Why do you say he is trolling? How can someone turn suddenly racist over the painting furore? Racism is like a religion, it is not logical or based on reason.
You have it half right, racism is a natural instinct meant to protect us from everything that is not us but can go haywire. Like hatered it mostly is not based on logic or reason but is something everyone must fight against... not just the whites EVERYONE. And no no one turned racist over a stupid painting, this reaction to it is just the latest in a long line of "we're black so we're right" BS from the masses in control, THAT is what is turning him racist.