Sarcapathy
A union of the words apathy and sarcasm. Expressing one's apathy with contempt that is not discernable by others as real or facetious.
Amway Salesman: "If you sell 18 feather dusters to everyone in your downline, you can be a millionaire in three weeks!"
Salesman's Brother-in-law: "You need a breath mint."
Salesman's Brother-in-law: "You need a breath mint."