Considering all the confusion it causes, and all the inconvenience, I'm surprised there's much of a fight to bring back hat etiquette. Part of me, most actually, says good riddance. We can come up with ways of showing how polite we are that leave our hands free for important things. Besides, who needs a hole in the brim from flopping the hat around all the time - up, down, up down, on, off, on, off - always fondling the brim. It's a Laurel and Hardy comedy skit. If people have forgotten, I say leave it that way.
That's just exemplary of a generation gap. We old timers view that as bad manners. I think it is probably an acceptable attitude among young people today. Fashions and attitudes change.