(Advice) How do you assert or defend yourself if you are a male with dark skin?

I feel like you need to be like Obama always polite and calm compared with what Trump as gotten away with. To the world, you are a violent angry monster that's just holding it in for now, at the slightest negative emotion it just confirms their suspicion. The world can treat you like a criminal and you cannot fight back. How the hell do you cope I can't really take it anymore.