More to my other question?

i have been dating outside my race for few years now and everyone around me is kool with it but my best friend of like 15 years is dating a guy that dont like blk people and dont like is saying it nice. well everytime he is around he is putting down blk people. the other night he really made me mad to the point i was crying. another friend of ours ask why people say once you go blk you never go back and her boyfriend said because no wht man would want a nasty f***ing after being with a blk man. ok this guy has been our friend since school but i took that to heart. what should i do