My boneheadedness is an ongoing thing. When a car, pedestrian, skateboarder, dog walker, or other road user violates what I consider my right-of-way, I tend to bicycle assertively, as if I were driving an old pickup truck and that assertiveness will make them do the right thing. To make things worse, I sometimes speak out and let them know what I'm thinking. Not a wise course of action when I'm riding what is a valuable and hard-to-replace vintage bike. I'm trying to stop doing it, but it's not easy. So far, no damage.