Someone please, please tell me this is a joke.
I'm going to give you guys the benefit of the doubt and assume you've been programmed to think silencing people who disagree with you is a reasonable response. Because I'm an idealist, and I'd rather believe you're too sensitive to handle ideas that challenge your own, than the possibility that you might not have the critical reasoning faculty to differentiate between real and entirely imagined sexism. I know this forum has collectively lost its grip on reality, but if things are that bad, then we have far, far bigger problems than campus boycotts and outrage culture.
This is how intellectualism dies on the Left - not with a bang but with a hashtag.
No one is telling him to be quiet. People are telling him he's insensitive and he needs to start thinking about the fact that the things he says can affect other people. People have every right to say that. Sorry if that offends you, but you don't get to tell them to shut up.