Had a similar situation with my ex (then current) wife. Asked her to tie a fender onto a cleat on the cabin top. She continued as I said, "that's ok, leave it". Finally I said sharply "sit down now!" just before we jibed. I'm sure she's still annoyed, though it saved her noggin fifteen years ago.
The current boom has put knots on my head, my crews head, my girl's head. Mostly while ducking (not quite enough) under the boom with the sail furled. The padeye is the worst threat, I'll have to do something.