because of the connotations and the usage history.
for fucks sake, is it so hard to understand? It's been used for hundreds of years as a derogatory term. It's racist. that's all there is to it.

/tried really hard to stay out of this one..
( the mighty badger Aphrodite, on a bar stool, by your side, Thu 26 Jun 2008, 14:51, archived)