That is interesting. First you did the right thing by talking to him. As far as the wave I think that by waving you at least acknowledged that you knew he existed which is not bad. In the heat of the moment he may misinterpret but there is not much you can do about that. I really don’t think you can do much more, from inside a car all you can really do is wave, shake a fist or indicate IQ and the last may been seen as a wave or a fist anyway.
By the way I will not bare with you but I will bear with you.