The one thing that gets to me more than any, is the headlights after dark on the boat ramp.
Typically I get caught up in a mess where people lack experiance of loading and unloading their boats, I try not to let that bother me because I was there once, we all were. A little of experiance speeds that process up.
Only on one occasion when I have stopped and asked someone to turn the lights out so I could back up, have I got negitive feedback, most people don't realize it until it happens to them or somebody nicely tells them.