It wasn't that I had become too frustrated to keep talking to him, it was that I saw there were not going to be any breakthroughs then and there tonight so I played one last card, the guilt trip, which failed miserably. I am thinking of confronting him more sternly tomorrow when this inevitably happens again.
Should I think about bringing the real estate agents into this, or even trying to get him and the others together in a room and telling them all what I think?
Anyway, this Ask HN wasn't just meant to be about my situation here, more about tips, philosophies and reading materials to help others deal with similar situations, especially in the business world.
(Oh and thanks for the reply!)