Can you write down what's bothering you, how it has a negative effect on you, and then what you'd like to see? Then send him that by e-mail, letter, or hand him the note at the beginning of the session?

I did this with my pdoc (last week actually - the next session post-email is later today!). It basically came down to:
I feel you've not always been listening lately, just "watching" and interpreting.
This makes me uncertain because those interpretations - it's grounds skewed in favour of what you see - might not be right and the solutions are thus not appropriate or helpful.
Would you be willing to show me better that you are, in fact, listening?
*metaphor/make-up example, then a joke about that to show that "we're OK"*

(I deliberately used /show that you're listening/ instead of /listen/ because I don't want to attack him by implying he needs to change himself or his methods or behaviour. I don't feel I can demand any of those things either. Just that I need to see that he listens and therefore I need him to show it. Unavoidable side effect will be him listening better!)

What do you have to lose by sending something? You can always leave the session after. Or he might change back to the interested T you felt so comfortable with.