It's a great quality in a therapist to admit when you're wrong or have things to learn. I love it when my therapist does that.

You can come away with a lot more than winning an argument that, in the end, doesn't make you a better therapist; using an opportunity for self-reflection and rethinking your approach, however, does.

Ditto what other have said about academics. It's their game. Their rules. Take what you can get and move on. And, btw, taking a loss--whether it's an argument, or a contract or a client--without letting it affect you is a great skill in the professional world. This guy has given you a gift. At this point, the main question is: how to respond in a way that keeps you in the program and moving toward your goal?