dj4monie touched on this in his last post, it's something a lot of people have mentioned. I know I've seen it. There's certain girls (read: ESCORTS) who will tell you right away on the phone "I don't date black guys".
Once when a couple of us guys here at HungAngels were out at a club, a girl actually asked if another staff member "was Dominican or Cuban because Black Guys are a No-No".
Maybe someone can chime in on this (and for the record 1) I'm not Black and 2) I lied and told her that he was Dominican. He had the most priceless look on his face when she kept asking him to speak spanish)