He took her phone out of her hand and threw it across the room?
I'm sorry, I cannot be on his side in this. Obviously she was WAY out of line, but he took her phone out of her hand and threw it across the room. As much as I might WANT to do that, I would never ACTUALLY do that. He has some serious anger management issues.
I would imagine that at a show where patrons are seated at tables, they probably have this issue a lot- patrons who act like they're at a restaurant (still using their cell phones... ugh) and not at the theater. I don't know that there is something less disruptive he could have done besides just ignoring her, but I'd imagine that the ushers/waiters could maybe be more proactive in policing that type of thing.