I think that preference exists and racist exclusion exists too. To say, "I'd never date a black girl," to me is racial exclusion. To say, I prefer blonde hair is preference. Our preferences tend to be a byproduct of past experiences. That's just a fact. You grew up next to a gorgeous girl with red hair and always dreamed of kissing her... but never did. Guess what? You're likely to have an attraction for redheads. Still, if you're not interested in forging new experiences, you're stuck only preferring a small subset of the opposite sex. Your loss. If you grew up only eating McDonalds, you're likely to eat similarly as an adult. Guess what dude? There's a HUGE banquet out there, with many flavors, shapes, sizes etc. and they're all worth getting to know. Humans can be awesome, all hues of them. My advice to anyone reading is to take the time to get to know as many as you can, regardless of ethnicity. Attraction is born out of interaction.