I hear you dude! We try to stay away from the river on weekends especially the long weekends. Last long weekend (in Canada) a boat capsized because multiple jet skiers were doing donuts right in front of the docks at a local public launch and dock. We ride thursday nights and the odd weekend to avoid that stuff. It seems once a weekend or long weekend hits, retards come out and the etiquette goes away. We have had people slow their boat down, driving 10 mph right by our boat about 15 ft away while we are picking our rider back up. It drives me nuts, it takes the relaxation of being out on the water with the guys and makes me soooo anxious and almost not enjoy the day(especially when the jet skiers ride over our wake and we have new riders, not even new riders but if we are trying new tricks and might fall, its just unsafe). All you have to do is try and be a respectful and courteous boater, and if someone is over the top unsafe, then let them know (at risk of being the fun police).
Any who, as you said preaching to the choir! And yea, it takes one idiot to ruin the fun. Just try to enjoy the time with you're friends, some good tunes, and thinking you're better than you really are (haha?). Try to ignore the *******s!
Shred on brother