If you don't like a joke, don't laugh. The competitiveness of the comedy industry at the moment means it's a free market for promoters. If an act doesn't get laughs, they don't get bookings. Given the subjective nature of humour if there's an act or a style of comedy you don't enjoy, don't pay for it. But don't begrudge anyone else who might find it entertaining.
Whilst I hope that Plymouth University do expel the likes of Jamie Street I have a sinking feeling this may not be the case. It makes me wonder, had the site employed a racist rhetoric rather than a sexist one (although I did spot a little bit of homophobia in one article - wouldn't want you to think the writers weren't liberal with their bigotry) would we have heard by now that Plymouth had terminated their relationship with Street.