First I'd like to say that I try not to generalize this against any jetskiers, as I enjoy the sport myself occasionally and know several good people that are safe jetskiers.
I was out on the Big lake this past Sunday (wanted to run my boat in fresh water at the end of the season) with some friends. I brought along a tube for pulling behind the boat and was dragging people around for fun.
As I was in a turn I saw a fast approaching jetski that was clearly going to cross paths with me and/or the tube. I slowed down and stopped.
Waved at the guy. He had two kids with him, so I calmly asked him what he was doing when he went by spraying the person on the tube, so he was about 20 feet off. He didn't seem to be bothered, nodded at me and went on. The jetski appeared to be rented as it had a company sticker on the front. We went on tubing.
Later in the day the same guy/jetski and another one kept getting close to us or would start making their mindless tight turns right in front of me in my path, so I had to slow down or stop, since I can't make tight turns with the tube in tow. I got tired of it and started taking the tube quite a ways out to try and avoid those idiots.
As I recall a watercraft is supposed to stay off any tubes/skiers at least 200 feet? But even common sense would probably dictate staying away.
I was thinking of calling the troopers since we got him on video, but then got over it and didn't want to ruin my day with this crap.
We still had an awesome day on the water and all my friends loved bouncing around in the water