I've had something similar happen in the air. We briefed on the ground that we would be doing stalls, and he had no objection. In the air, he refused to do a full stall saying that he "just won't do any accidental stalls."
I tell him that if we don't do full stalls, I can't sign off his flight review. He immediately turns into a 3-year old, so I take the controls and bring the plane in for landing. He gets out, won't even come inside to log the time. Just goes to his car and drives off (fortunately we got his card on file with a signed authorization before the flight, so we were able to still bill him for the flight and ground time).
All things considered, I'm glad I don't have my signature anywhere near his logbook.