Way out of line.
Slap my kid, and I punch you. Fair enough?
I totally agree. You remember the scene from “Kindergarten Cop” where Arnold confronts the abusive father? After Arnold decks the scum he says, “You hit him, I hit you.”
Heck, I have an 8 year old who has caused us to stop taking her shopping because she still wants to touch everything, and when we try to stop her she causes a scene. Well, no shopping for her.
I’d do a little bit more than punch. That guy would have to visit the doctor after I go through with him. When I didn’t have kids, I couldn’t stand a screaming child. Now that I have 2 small children, I feel for the parent (for the most part). Anyone slaps my kid, they’re in for a world of hurt.