Reverse Prejudice

I've noticed that white guys, especially young white men, are disappearing.   From high school, to college, to graduate school, more women are graduating than males.  There are all sorts of special groups encouraging women, black people, gays, etc., but the young white men not graduating from high school and college, who is encouraging them.  There are all black colleges.  Would it be legal to have an all white college?  What am I missing?