Touhou gets mixed up with everything else, so I don't see any reason why gender politics should be an exception.
Besides, rape jokes aren't funny.
Rape jokes can be funny just like everything else, it's just that very few can actually make them work beyond le ebin maymay tryhard edgelord level and is also in general a very acquired taste that can be easily misinterpreted. I can only speak for myself since my own sense of humor is extremely morbid.