Jewish culture isn't something he's had much exposure to, but Midge probably guessed that. It just gives him another reason to listen, and try not to be distracted as she slinks towards him.

"I don't know how much you know about men, but that's not generally the most encouraging thing to hear."

His free hand strokes up and down her back, enjoying the curve of it. Given his smile, he's not actually offended. Just very amused.