What did the 14 year old say when being molested by the well endowed uncle?
What sort of punchline is this? Are you trying to make a joke about child sexual abuse?
It's a just a joke, I'm sure the 14 year old didn't mind.
Child sexual abuse is not something to make a joke about. What if this happened to your family member? You have to show more compassion for victims of such abuse.
I am being compassionate, I'm only joking. Just because you don't understand my humor don't think everyone else is the same.
What you're doing is making it seem like child sexual abuse isn't terrible, by giving it a punchline. While this won't hurt anyone directly it is making light of something that should be considered serious at all times.