My personal view is that a person is racist if race is a prime motivating factor. For instance, I have the utmost respect for Barack Obama, but so many of the blacks in my community were voting for him just because he's black, not based on political views. Even some black members of my church, which is mostly conservative, voted for him for this reason.
One is also racist to me if they try to create victims out of other races in order to 'prove' they aren't racist, such as the media when Star Wars Episode I came out and people criticized it because it portrayed Jar-Jar as a Jamaican. Excuse me, I didn't know that Jamaicans looked like ducks, walked funny, and talked in pigeon English. If you formed *that* connection in your head, you must be the racist one, not George Lucas. Same with how they said Watto represented a Russian and Nute Gunray represented a Japanese person(slanted eyes and capitalistic war-mongers).
I also think that it's a bit racist to hold grudges against 'whitey' for what they did few hundred years ago. Yes, people back then own black slaves. Quit beating me over the head with it! I know that some whites were and still are racist ba***rds, but don't alienate me because of it. If I see your kids acting up, don't accuse me of being oppressive and racist towards black kids if I tell them to settle down, talk in a way that I can understand, or turn their music down. It's called common courtesy and they need to learn it before they become loud, obnoxious adults.
Okay, enough soap-boxing: what are your views on what makes a person racist?