You don't say how old he is, but it really doesn't matter, that child is NOT going to potty train if they go about it in this manner. And the fact that they are so completely dismissive of your thoughts and opinions tells me that you are definitely not a good match anymore, if you ever were to begin with.
I have no further advice, but thank goodness you only have a little while longer. And here's hoping you find a fantastic family to fill that spot!!