I find the idea of therapists teaching adult clients about boundaries or imposing boundaries to be inherently shaming and punitive, unless the client is severely impaired. What is the client meant to learn from this? How to behave according to someone else's arbitrary rules? That responsibility for conflict is always theirs and it will be resolved with a verbal spanking? Has no place in a healthy adult relationship. It's an affront to basic dignity.

And in a case like this where the punishment is overt, then it's truly toxic. If the therapist is not taking any responsibility for the conflict, it is doubly toxic. The question of whether or how to get away is a difficult one. But if it were me, first thing I'd try to do is put things on context.