At the dinner table with my mom and her fiance, we began talking about his brothers.
I told my moms fiance that, "You're brother is pretty feminine. But that's okay, because femininity is great."
He was offended by that, so replied with, "oh, and what have you been doing with in your bedroom with your feemminiinniity (femininity) all day?"
They laughed.
更新1:
I have never masterbated.
更新2:
I am quite frankly, disturbed. He has made jokes about those kind of things before, in front of my mother no less.