I think it is normal to have those thoughts occasionally for everyone and I would have hard time believing a T never has them, especially given that they listen to others' issues every day. I'm not a T but I have those kinds of thoughts pretty often, sometimes as a reaction to something I genuinely disagree with or do not like, other times simply just due to momentary mood or overwhelm. I doubt that any training will just erase those, they are momentary emotional reactions. The thing is not to aim for never having them, but to be able to act in a civil, respectful way.

Like stopdog, I have no problems with their having judgmental, overwhelmed, bored etc thoughts, I most dislike that many claim that they do not think and act judgmentally about clients. They sell an ideal, some people buy it and want to cultivate it, and when it breaks because there is just no way to hold it up anymore, the client gets very hurt. It is irresponsible marketing strategy and behavior, IMO.