[Drolefille]

That power exists on that personal level, not just a societal one.
Wouldn't you say that a black person who refuses to serve a white person is the one in power at that particular point in time?? If it's about power and power alone, then it isn't just about society, it's about the interpersonal relationships. If a black teacher harasses his white students, then he, in the position of power, is racist. Using a racial slur puts you in power over the other person (no matter the color) by knocking them down a level.