She's not a little kid, if it was a kid, yeah then you don't "stoop to their level." She is not a little kid though, being a teenager is supposed to be when you learn that there are real consequences for the shit you do.no. regardless he's the parent and shouldn't be stooping to her level.
Teenagers are >.< Impossible. I have two of them, right now. I cannot convey, and find it imprudent, to post how I feel when they act out, but it's goddamn hard and I think he showed restraint if anything.