The problem was that students were petitioning to stop him from speaking there:
Bill Maher is a blatant bigot and racist who has no respect for the values UC Berkeley students and administration stand for. In a time where climate is a priority for all on campus, we cannot invite an individual who himself perpetuates a dangerous learning environment. Bill Maher’s public statements on various religions and cultures are offensive and his dangerous rhetoric has found its way into our campus communities. Too many students are marginalized by his remarks and if the University were to bring this individual as a commencement speaker they would not be supporting these historically marginalized communities.
It was a pointless effort from the start. Maher’s job is to share his opinions and make jokes about touchy subjects. As far as opinion-leaders go, his biggest liability is that he talks about topics (like religion) most people want to avoid at all costs. While the bigotry charge was over-the-top, the racism charge was just baseless.