He cares because maybe he doesn't want to be scammed. It shouldn't be a big issue if he asked OP the question and OP didn't have any ill intentions and respectfully answered it.
Sorry, my bad, I shouldn't overreact.
He only wants to "trade directly" without escrow
Maybe, since he wants to pay you through your bank account, there's a high chance it will be a direct transaction.
OP leaves email to trade, chances are he won't come back to this topic, so advice for some of you to be careful, there is always a risk when trading here.