I don't think you handled your boat irresponsibly. Ther are no real hard rules for being around regattas, as everyone is entitled to the water as long as your safe. However thoughtfulness goes a long way. I think you are on the right track.

First I would stay out of the way if at all possible.

Next I would try to be mindful of the wind shadow that the boat is creating. Some crews travel hundreds of miles to compete and it is frustrating for a spectator to drive through the course when your fighting to catch up (as I usually am) casting a huge wind shadow that makes you tack when you normally would not.

Other than that atleast your thinking about it. Most people drive through, oblivious that there is a race at all, big powerboats are the worst!