If you rape a prostitute, is it rape, or is it shoplifting?
Are you sure you feel it is okay to joke about this? It sounds demoralizing to me.
It's not a joke, it's my opinion, I'm allowed to hold an opinion and they were prostitues!
You should never make it seem okay to harm anyone, even a prostitute. They have feelings and lives outside of their jobs, and kids to support most likely. Just feel lucky you never had to put yourself in their actual shoes and sell sex for a living.