I definitely don't think that what clients say and do have no effect on the T, it was absolutely not my experience and does not even make sense theoretically speaking. Remaining patient and not showing strong reactions is something some of them can do, but no way one can just turn off internal emotions (whether positive or negative) at will, no matter how much understanding, training and self-discipline. Not expressing it and remaining professional is what can be practiced and mastered, I think. Also, I imagine Ts hear so many emotional *** all the time, a lot of it repeatedly, that they become quite immune to a lot of it. But I can't imagine it not having some kind of impact. I try to be as professional as I can in my work and communicate that way but internally I still feel all sorts of effects from interactions, some bigger than others.