My girlfriend called me a pedophile yesterday. I said, "that's a pretty big word for a 9 year old."
Do you think it's appropriate to joke about child abuse like that?
I don't see why not. It's just a joke, lighten up!
Child abuse is a serious issue and victims of it suffer extreme trauma from it. Joking about it makes light of it and trivializes the experience they had. You should think about how you would feel if a family member was abused as a child before making jokes like that.