It is no surprise, really. College campus leftists are the most radical and do not believe in free speech unless it only applies to them. I’m sure the campus staff/officials didn’t throw out the protesters as they want to hinder the “free speech” of the protesters.
This sounds worse than the treatment Jeane Kirkpatrick got when she tried to give a speech at UC Berkeley in the early 1980s—in that case I think it was just a small minority who were heckling her. The left has gotten more aggressive in shutting down views they disagree with.