The Wrong Butt Of The Joke

(In my bio psychology class we are discussing a rather unconventional topic that tends to make people just a bit uncomfortable. I should probably mention that the professor is a little crazy.)

Student: “It’s not like everyone has to get all butt-hurt about it. It’s a simple question.”

Professor: “Butt-hurt? What does that even mean? I need to get caught up on the slang you kids use these days.”
Student: “It’s like… taking offense at something?”

Professor: “Well, I don’t know about you and YOUR sphincters, but mine is totally fine right now.”