Sure doesn't seem like it was handled in the best manner - you'd think at a minimum the player would be suspended and required to apologize to the AC personally and to the team. What is missing is the content of the conversation between the HC and the player. It may be that the player is having personal issues at home or the like, and he lashed out? Doesn't make it right, but things can be hard on young adults and they don't have the maturity to handle. If it was just the kid being a jerk though - that is a bad precedent! Hope this is a one time thing that does not adversely affect your team.