Yes but only have one experience, my second therapist's reactions to my first one. It wasn't consistent. Very early on when I started with the 2nd, I told him quite a bit about my previous therapy experience in general including a few critical things about the 1st but not only negatives at all. He (2nd) expressed a keen interest in "working through" those with him (whatever that means). He was more on the other T's side for a little while as though I, the client, were unaware of some key factors. But very curious, even asked the 1st T's name (I gave him) and then he checked out his colleague quite thoroughly online. Much less impressed when we next talked about it and soon he was on my side and criticized his colleague for infusing my therapy with his issues too much (well, that's what I thought from start). Not sure if he (2nd T) just wanted to mirror me or that became his genuine opinion with more info on me and on the 1st T, but it became a stable view of his.

What does it all mean? Not sure... probably no general patterns among situations but I assume professional competitiveness (don't think that equals to jealousy) plays a role between T's just like in most other fields. I imagine when they speak against a former T that the client liked but the two don't know each-other directly, they perhaps use a tactic to try to discourage the client from going back in case things turn sour. Just guessing.

One could say ask the therapists what it means but I doubt any of them would give a very genuine or full answer, it would not be their best interest.