Sam's reply is along the lines of: Jerk. (And we all know what that is code for.)

Schmuz is wary as hell of Dean. He goes out of his way to just...be eminently forgettable while Sam is around Dean and won't talk if he can avoid it. Because Dean is the one person who could talk Sam into getting rid of Schmuz. And while he wouldn't object strenuously to going back into stasis, he's not positive that Dean doesn't see him as enough of a threat to not want him dead. But, given everything, Schmuz is pretty damned paranoid to begin with.