Being raped is traumatizing. It's just one of the most awful things that can ever happen. Ever. Mostly because often it's by someone you know and are supposed to be able to trust. Partly because feeling defenseless and powerless in any way breaks the human spirit. It's not something that the vast majority of men have had to deal with on the receiving end, and that's why when one of you trivializes it in any way, women react strongly. It's because we really feel that you just don't understand.
Rape is terrible. Everyone knows. Now lighten the fuck up. Murder is worse, people joke about murder all the time. Haha murder! What could be funnier than stealing the one life a human being is given, ending his existence, intentionally because of some arbitrary decision one has come to when judging another. Laugh riot. Someone touched the magic underpants area without permission?? Let's all be very serious. Very, very, serious. Maybe throw in a FEW murder jokes to lighten the mood.