I have no idea who was being sarcastic or not. But there is no good reason to strike a child to correct bad or unwanted behavior. Hitting a child perpetuates the false concept that violence is ok and appropriate. I raised two children without ever raising a hand to strike them. When undesirable behavior needed to be corrected, I would take away possessions or privileges. This clears up any unwanted behavior very quickly. Consistency with this policy is also key.