Why am I considered racist for thinking that black men make great boyfriends and I'm not into white men?

I think white men are not to my liking in terms of being fun, interesting and intelligent boyfriends. Black men make me laugh, read a lot, and work hard. Why am I considered a bigot for feeling this way? Is this the same as saying that I think black men are more fun and make better partners than white men? Why is this considered bigotry?