Free Speech Includes Racist Speech

There are few things I like less then fraternities, but racist frat brothers is one of them.  I'm speaking of course, of the Sigma Alpha Epsilon fraternity at the University of Oklahoma.  Members of Sigma Alpha were caught on video leading a racist chant.  Since the video surfaced, the University has shut down the fraternity and also expelled several of it's members.  The chant in the video was unquestionably racist, but also unquestionably free speech and expelling a student from a public university because of the content of their speech is unconstitutional.  I hate defending racists, but as someone who is politically outspoken, I would be a hypocrite not to defend the right of people to express their opinion no matter how disgusting you or I may find it.