I am not a fan of hitting a horse in the head ā any part of the head ā for any reason. The neck or body, OK, but never the head.
Goober is called Goober because he grabs everything within reach of his body (or his turnout friendās body). Poor Petey no longer has a neck warmer because Goober ruined it. Nothing can be left within striking distance of his mouth. If it is there, it is fair game. I just have to be very aware of putting grooming tools, blankets, etc at least 6ā away.
When I am interacting with him I reach a compromise which he understands. When putting on his halter, he has one āfreebieā that allows him to grab the nose piece as it starts over his mouth. I wiggle it back and forth until he drops it, Then he is perfect the 2nd try.
All those years when I would get after him for grabbing the noseband (nylon grooming halter) never made it better. But when I briefly āplay the gameā he is happy to let me do what I want after that.
This habit is more about training me, than training him.