I wouldn't let it bother you. I honestly don't believe most of it is intentional, they just don't know. Over the years I've tried not to let other folks actions make or break my day. I watch some guys come into work all mad because of something someone did on the drive to work. I'm willing to bet 99% of the time the othe guy doesn't even know your alive.

On another thought if you have a boat without much free board, you should use caution where you take it.