I think it is a large assumption that conservative leaning = racist. There have been viscious racist incidences in all areas and many kinds of schools, including areas known to be liberal like California. African American students have raised concerns at UCLA and the recent display of anti-Semitism there was personally sickening to me.
Do we judge a whole school, political movement, and type of person on the basis of some idiotic and poorly brought up students who think it is OK to mouth off in the radio, a bus, or any other event? Yes, there should be consequences for that kind of behavior and in many cases there are. However, once we start judging a whole group of people, or an entire college on the basis of the actions of a few, that can lead to false assumptions.
Kids have spent 17 -18 years of their lives somewhere else before they bring this kind of behavior to campus. If they are saying this kind of thing at college, then they heard it somewhere before. Colleges can- and should- do what they can to make sure it is not tolerated on campus.