I'd suggest avoiding any sort of retaliatory behavior or aggressive acts.
Put a golf ball or flare thru someones hull, or simply pointing it at them, loaded or not, and I'd double down on who's getting a visit from the fellas w the badges.
Psst: not the guys w their headlights on........ And I'd also bet its not going to be a little slip of paper w WARNING written on it.
Not every boater using docking lights incorrectly is doing it simply to ruin your boating experience...... Nor a moron, and not an entitled, arrogant jerk.....
Yes, you will encounter all those types of boaters.... Its called interacting w the general public....
Some wont take your helpful critism well....
Fewer still will take your 'advice' when its offered in a hostile manner.
Right or wrong, they think its helping to avoid debris in the water or figure out where they're going.....
And it usually never ends well when you try to right a percieved wrong by also choosing to behave rudely...
Be thankful you can enjoy a boat and boating...
Some (many?) cant...
Gripe all you want about it but its still better then a day at work.
If people, boats and other boaters bother you, consider buying a lottery ticket and when you win, buy yourself a nice private lake, so you can be the sole boater on it. And enjoy knowing no one else can disturb your private boating experience.........
If you find you only meet jerks and rude people as you move thru life, it may be time to look in the mirror and decide that the problem isnt entirely other people.