You say you are paying him to keep HIS feelings out of any situation with you. I agree. You are paying him for his professional attitude towards you.

You would not be getting fair value if he just said to himself, "my PERSONAL feeling is that it is no big deal if i stand or sit. But my PROFESSIONAL understanding is that this should be explored, under tension. Eff it, i will stand."

This seems to me the same point you reached with ex-MC, except MC made a mistake and acceded to your demand, continuing the off-session time phone call. That was a one time shot, which you won, but you ultimately lost.

This time you have a much better chance at resolving the issue, as it is ongoing. You must be feeling pretty safe, despite saying you want to quit him.

Eta - just read your reply to Art. I agree, i was surprised your email was so focused on rehashing what had happened, rather than what it meant. So i think he simply replied in kind to the quantity-content.