It's all about risk, Eric. If the school thinks there's a high risk that somebody will be offended by a particular event, the chances are that the school will decide not to put that event on. Why invite the hassle? It's not the Morris side who would be getting the visits from irate parents afterwards.

Telling the school that they're wrong to be offended - or that they're wrong to think anyone would be offended; or that anyone who might be offended would be wrong to be offended - isn't really going to cut it.