Welcome to the site. That is a brave and honest first post. Do you and/or your son see his attitude/arrogance as a potential problem with coaches at the next level? Are there any issues with the travel team coach?
The fact that son plays on a top travel team and he has a good skill set (and he is confident) will obviously garner him opportunities, as you have already experienced. However, if the attitude/arrogance issues are significant, this can both cost him further opportunities and make it difficult for him to fit in well with a college team (as well as the coach). So, taking the higher road, shaping up and making every effort to give the coach what he wants for the senior year can only be a worthwhile exercise, even if the coach rejects the attempt.