It's sort of like this...
I go to a women's college.
I've been around men all my life. How is going to college to be around more men going to help me? There is a considerable amount of disadvantage:

1. considerably less women in leadership positions
2. male favoritism in class
3. just plain nastiness towards women by men
4. male-centered curriculm
5. pressure (if you're heterosexual) to be attractive to the men around you

etc.
You can make that argument for black people and whites.
Now add other ethnic groups to the mix and its different (its not necessary for black people to learn about Korean culture, for example, to survive, so it's a choice, plus noone is teaching it to K-12 it seems, and in college, you can choose not to take a Korean studies class if you don't want to.)I don't know any largely multi-ethnic schools, though.

It just BES that way sometimes.

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