Girls, do you think it's fair to hit a guy in the nuts under certain circumstance?

My older brother's friend wouldn't stop bugging me and my friends when we both had friend over one night, and i told him if he came in my room I'd kick him in the balls. Then he ran in and tried to fight me, so I kneed him in the nuts twice and then my friend kicked him when he was down. It was really funny but he says it wasn't fair. I think he deserved it cause he was warned.
Girls, do you think it's fair to hit a guy in the nuts under certain circumstance?
Post Opinion