Adding:

"I'd never date a black girl" generally means "I don't find any of the black girls currently in front of me attractive enough to risk my self-esteem on them." Dating across races requires a little bit of daring, a little bit of xenophilia. Far easier to say "I do not wish to be rejected by an other that I do not fully understand. Far easier to stick with what I know."

However, it generally means this from people who do not understand that by dismissing someone based on race, they are dismissing that race, not the individual or individuals in front of them. By attempting to spare everyone the personal rejection, they have created the general rejection.

I'll admit it - I've never dated anyone black. Hell - there was one black girl in my entire school district and I wouldn't have dated her if she were white. So in a way, I definitely grew up only eating McDonald's. But hot diggity damn I have been surrounded by stunningly attractive black women.

Just never when I've been single, dammit.

It takes more confidence to not only risk rejection, but risk rejection outside of your typical understanding. I think that the conflation of "taste" and "race" is subconscious and unintentional, and I don't think it's likely to go away.

That is, until all that's left is various shades of mocha.