Hey, he has a right to free speech, okay?  So, really, the "lefties" are denying free speech and they are the real fascists here!  Never mind that he says Jews, Blacks, Latinos and a host of other people are inferior.  It's okay because it's his opinion, right?  And everyone is entitled to express their opinion!  So if you try to shut him down, it's really YOU who are the fascist.
Or, see Sir Karl Popper's essay from 1946 on tolerating intolerance.
Why the hell would a University host a scumbag like him?  Is he actually going to contribute to the academic environment of the place?