However, consider that there are no 'training wheels' for sailboats. You buy one and you end up out on a course with a limited knowledge of the rules and how you should act. A lot of us had the opportunity to learn young - I damaged my share of dinghies way back when. But for adults with money who want to get into the sport, even a 6 week 'learn the rules' seminar isn't going to give them the experience they need.
You've really got two options. First, lambaste the guy, embarrass him, and generally make him feel like other sailors are a bunch of shitheads. Or, find him after the regatta and discuss it with him and find out how he's going to make things right. He may be the nicest guy in the world who simply doesn't have the experience or knowledge of how to sail.
SA constantly bitches about dying fleets, disappearing racers, and the like. He's out there trying. Give 'em the benefit of the doubt.
Now I'll wait for the assholery to begin.