Your son will get there. I hope your frustration and anger with T isn't spilling over into the potty training issue. What worked for my son who was nearly 3 was to put a candy jar on the vanity counter in the bathroom right where he could see it. Whenever he used the pot, he got a piece. No limits. After a few weeks the novelty wore off but the habit remained.
My mother used to go nuts about my son being in diapers at his age. ("I had all you potty trained by 2 at the LATEST"). I told her to relax, he would not be 23 and still in diapers.
Brian, your T knew your issues and any comment you made was a normal part of therapy. We say what we are thinking. It's up to T to explore and help us understand it. What you did was right and normal (whatever that is) and you didn't cause T to terminate, no matter how she might be trying to spin it. I think she was right to terminate because she saw her limitations and that she could not be helpful; but I think she handled it wrong, by implying you are somehow to 'blame'--as if blame would even be appropriate. She simply made a choice that was hers to make. My guess is that she felt guilty for terminating and so she had to deflect that by implying or assigning blame.
It is so rough what you're going through. I wish you had a good T to help you with it.