Most Helpful Guy
People have gotten so they use that word too freely. Maybe it really was a joke, but it's in poor taste in my opinion. Unless he was serious, I don't think it's something to get mad about, but he needs to learn to watch his words.
Most Helpful Girl
You could get mad... if you're sensitive.
I'd probably leave him one saying "Hey Fuckboy!"
I'd share his sense of humor instead of getting offended when I don't need to be.