Unfortunately it seems these days there are a fair few people who conflate people disagreeing with someone or not liking what they're saying as "cancelling" or "censorship", when in reality they're either challenging what they say to spark a debate or not providing a platform for views they disagree with because there is no requirement for them to do so. There's no more reason why this theatre "should" put on RCB than there is a reason why the Daily Mail should be forced to carry opinion pieces by Jeremy Corbyn, it's their choice.