Anybody can have power. If you have a sway over the streets, then your prejiduce all of a sudden has more point to it. If you put yourself in a position of power over somebody, while making racial points to back it up, then you're racist.
If I was walking down the street alone, and you and 4 of your friends looked at me and was like "Fuck you, whiteboy", you'd be racist because you had the position of power right there, right? I mean, 5 on 1 is a definite power advantage, right?