How can I keep my brother from becoming a bigot?

A few days ago his best friend, who is black, was accussed of by a white girl, that he had with at a party. My brother was also at this party and he says that nothing happened and the girl is lieing. Anyways, he was dating a white girl and he broke up with her and he keeps saying stuff like them bitches aint **** ,talking about white girls. I know he is hurt right now because his best friend is in serious trouble but thats no excuse to take his anger out on an entire race of women. How can I make him see this?