I had a head coach like this for Varsity in high school. I eventually went D1 on a full ride for four years and was captain. I only give that anecdote to say that in hindsight my experience with that awful coach really built resiliency. It taught me that sometimes you have to deal with toxic people whether it is in the workplace, higher education, or elsewhere. I had to build skills to be able to manage my own reactions to that behavior and compartmentalize. I know I will be the minority where most parents like to intervene nowadays, but while it was terrible at the time, I really feel this was a life experience that served me well down the road.