Obviously as a black person, I don't think there is anything inherently wrong with other blacks. We aren't dumb, we aren't lazy, we aren't dishonest.
That being said, I feel most comfortable with those who grew up in households more similar to mine and sadly the majority of blacks weren't brought up in similar homes. Consequently, I have friends of all races- black, white, asian, hispanic and quite frankly- I love it. Does that mean I feel better than other blacks? No. Does it mean that I think I'm white, that Im a traitor to my race? No. It just means that I want to associate with similar values and lifestyles- which is IMO-what most people want.
So, I see no reason why there is anything wrong with blacks who choose white sororities/frats over black ones. Hanging out with other races doesn't mean that you hate your own.