When diplomacy doesnt work, pick up a chain saw.lol      Works for most.lol

Most people do the right thing on the water. 99.99 percent of people did when i went jet-ski-ing.
I told plenty of people to behave or get off the water, most people apologised and said sorry cause they were caught up in the moment and didnt realise they were doing something unsafe. No one ever carried on and ever threatened back because NSW is a easy place to get locked up if you act like a tool, and the safe always outnumbered the idiots 100 to 1.
QLD is also family friendly on the waterways. Most people stop hooning the instant they get called out, espescially with todays mobile phones with video and normal photo abilities.

On the whole, its like anything, most people just have fun and the bare minimum act silly til they are pulled up by the majority.