Let's just go with this for a second. Let's say you're a non-white going for whites, and girls in your ethnic group also go for whites. Who do you think stands a better chance at success. An ethnic girl trying to land a white guy, or an ethnic guy trying to land a white girl. I remember OKCupid doing a study on this; according to their survey, white women are the pickiest group of either gender and any ethnicity.
Fact is, unless you're a minority, you really don't know. I've had a guy who was 6" tall tell me "height doesn't matter". Yeah. For him. For short guys, it does. Unless you're in something, you can't relate.
The bulk of men in here trying to speak on minorites in the dating world are not actual minorities. No offense of course, but that's just the reality. A white guy telling me race doesn't matter or that I'm making too much of it etc holds no weight. A fellow minority telling me that, would obviously be worth more.
Now I'm of the belief that we are free to date and bang whoever we want, but let's be real here; certain people have advantages in the dating world. You just have to work harder. I would never say "well, I'm striking out with white girls, guess I'll give up". No. I'll say "well this chick missed out on a good thing because I'm hispanic, time to find a white girl who digs hispanics."