Why are some Caucasian' still so Racist?

I'm writing a paper for school, and I originally wrote about Singers needing voice lessons to avoid getting Vocal Nodules, polyps n such, but it wasn't debatable, no one would have disagreed, and that's what this paper is, basically a debate. Now I've read a couple Yahoo! Answers, and I realize that a lot of people are calling others idiots, because they are curious. W/e do what you want, just please try to answer my question before you start calling me an idiot. (Btw, before we go on about idiots, I just want all the Flamers to know, that I am in college for Computer Engineering Technology, and I have a 4.0)