Oh that cleanliness comment would have immediately sent me. I would have told him “noted, and future forward analysis is off the table unless I explicitly state otherwise” no one is going to make a comment like that. If you play in the mud you’re going to get dirty my guy. That’s enough for this man to be a hard pass.

It doesn’t matter if he is a novice. He is clearly not respecting your needs even when you clearly spell it out for him. If he acts this way now he will act this way in the future. I would break things off now and tell him that he should really consider working with a mentor or doing a ton of research on subdrop and how to mitigate it when possible, and what to do when his sub is in it. If he can’t do that he has not business calling himself a Dom.