I've seen racism, but from what I can remember, it largely came from minorities (but then again, I didn't go to schools that had a huge number of whites).
As others have implied or pointed out, most of the racism came from blacks. First of all, I had a lot of black friends in school (but I lost contact with them due to going to different schools. To be fair here, I didn't stay in touch with really anyone at all), but again, most of the "stereotyping" came from minorities.
I remember getting taunted mercilessly by some hispanic kid in 6th and 7th grade. Only the intervention of his girlfriend was able to keep him from going too far (I was friends with her). A black kid often made fun of me too, but I largely shrugged it off, since I didn't really care what anyone thought of me (whether good or bad), and I remember hearing a teacher tell me that kids will do stupid things like this, and to not let it bother me.
I got my "revenge" on them by making them "bad guys" in a little comic book I drew to win some attention and admiration from my other classmates. It didn't hurt anyone by doing this, and I could "kill" them however I wanted (in my comic book of course lol). No doubt they inspired me to see the bad side of humanity
Interestingly enough, I don't remember any white kids making fun of me at all (or if they did, they did it behind my back). But the vast majority of them were richer kids, and either had cars, or at least better clothing, which often made me feel inferior (they weren't doing anything consciously as far as I could tell, but that "aura of inferiority" kind of sunk in on me, so I couldn't really relate to them much at all unless they had similar interests as myself, which most of them didn't. Growing up poor sucks when you're faced with kids who are better off socially and financially).
Sorry for going slightly OT, but I figured this would probably relate into the racism stuff.
Jam it back in, in the dark.