The first time the reality of social conditioning actually struck me was when my friend (white female) said she would find me attractive "if" she was into black guys. I was actually sorta shocked, it was apparent I was because she immediately followed with "you're mad at me aren't you". Lol not mad, just the reality of the world sinking in.
What kind of response did she think she was going to get? That's such a backhanded compliment. I feel ya though, the first time you get rejected purely on race is always the worst one. You get used to it, but it still stings a bit when it happens. Unfortunately, the other side of the spectrum were they're into you completely based on your race isn't much better.