The guy wasn't rude. He was just trying to be funny. Who knows maybe he was just trying to get some people laughing. As far as the rinse tank goes if you are relying on that to take care of your reg you are crazy. That quick dunk in the rinse tank isn't doing a thing for your regs. BUT if you want to get back at rude divers try these. Dish soap in the exhuast tee, freeze their wet suit in a block of ice. Food dye in the booties. I could go on but use your imagination and send a message covertly-Dive Safe-Dive Alot-M