When my last T did something similar to me it triggered a long buried/dissociated traumatic response to similar things my family had done. Those feelings were extremely demoraling in part because I was so dependent on my family and had looked up to them. The situation was too awful and disorienting at the time and so was numbed out, dissociated and not processed then. It just sat there, largely not conscious.

Why was the similar action -- shaming me -- so traumatic and disorienting when the therapist did it? Because I was still dependent on the attitudes of others, and in particular her, toward me for my sense of self and purpose, to some extent. Let's accept your assumption -- it shows how little you were to him. And then back up a bit. So why does it bother you that you were worth so little to a therapist so full of his own issues that he can't see you clearly?

I know part of why it still bothers me how my last T treated me. Doesn't make it feel a lot better but hopefully in time. . .