http://blog.okcupid.com/index.php/your-race-affects-whether-people-write-you-back/

This is the closest to "proof" as you'll get. As you see in this chart:
http://cdn.okcimg.com/blog/race_affects/Reply-By-Race-Male.png

The only folks that appear to get replies from a broad swath of women are white men and pacific islanders.

It's easy to be on some "we are the world" shit when you haven't experienced the social ostracization that many non-white men have to deal with when it comes to dating outside of one's own ethnicity. THIS is the privilege that I referred to earlier.