I am not sure what exactly counts as traumatizing, but my first T's behavior reminded me very much of a couple other people I was dealing with a few years prior, who had similar tendencies and personality, and it was extremely frustrating. It certainly reminded me how much I dislike that kind of behavior and how strongly I can react to it. What angered me even more was when, instead of owning his BS, he put my reaction down to some parental transference and even made up stories I apparently told him about my parents that were similar - those things did not exist. He was clearly trying to gaslight me. Everyone, or at least most people, would be mad at that sort of behavior without any "issue" in their past, it is simply unprofessional and abusive.

I think many Ts get away with inappropriate behavior claiming that therapy is supposed to bring out traumas, and some do it over and over.