Me: The first rule of negotiation or selling is never insult the intelligence of the person you are asking to make the deal. This way of passive-aggressive insulting while asking for a favor is probably why you are going to bed at night lonely with your hand. While I head to the bank and then home to the warm embrace of my wife.
Update:
Just so that we don't lose the teachable moment- I went that harsh with the young brother - so that he would see how his words can affect his expected outcome. It wasn't about telling him off. It was about educating him. He did not close the deal but he learned a valuable lesson. And as such, I will probably do a deal with him in the future.
Take home: Don't let your pseudo-intellect keep you from getting your goal. Egos Don't Cash Checks.