I must be the most serene dude on the planet, because I swear to you that I have never hurled a racial invective at someone. No, not even when I was a kid. And no, not even when I was drunk. I'm not boasting, because it would be pretty sad if I wanted kudos just for avoiding hateful insults. To me, that should be basic behavior.
Language is a living thing, regularly pruning words that once had benign meaning ("retarded", for instance, was a medical term for "slowed") after they take on connotations beyond their original point. This process is not just window dressing or political correctness but rather a chance and provides a regular re-evaluation of whether we are saying what we really mean.