A T's emotional reaction to a client is very important. If T finds a client boring, perhaps others do as well. So to me this would not be an occasion for "calling out", it would rather be an opportunity to talk about what might be boring and whether and how one might become more interesting to other people.

That is a very healthy attitude towards negatively-tinged feedback and I agree with you. Whether I could actually put it into practice repeatedly, I'm not so sure.

However, I also think that Lola's point (and it's not that she needs me to speak for her, she can definitely tell me to f off if necessary) is more that she would feel free to tell her T that it bugged her that she was bored. And this is also a very healthy attitude towards T; it is good to be open with T about how what T does and says affects us.