Censorship

Racism is one of the few things in this world that's worth censoring.

I am engaging this for the purpose of enticing debate, but why should racism be censored?
What makes racism so important that it constitutes even a little consideration?

In my opinion, racism should be censored because it is offensive. If it has to exist at all, anyway. It's a form of bullying. I mean, judging someone just because of their race? That's like judging someone based on the sole fact that they have green eyes.