The teacher and the headmaster, and possibly others, must be fired. That is the only appropriate response. Anything less is a cover up.
Why would they be fired if the faculty, the donors, kids and parents live their lives with phony “white guilt” and think like this.
Things like this are nothing but superficial examples so they can pat each other on the back as they tell each other how accepting and some they are, sipping Chardonnay, while sitting in a $3,000,000 brownstone or condo with views of NY Harbor.