(overheard) public sociopathy

Just now, in the Harvard Coop coffeeshop, a stranger starts talking to the two people at the next table--sociologists who have been discussing the very "heated" Duneier-Klinenberg (he-said/he-said-and-blamed-the-victim) debate in the most recent American Sociological Review:

"So, what's the difference between a sociologist and a sociopath?"
"I don't know. Is this a riddle?"
"No, I'm asking. Are all sociologists sociopaths?"
"I'm a sociologist, and I'm not a sociopath."
"Me too."
"The only sociologist I know is a sociopath."
(pause)
"Or a psychopath."
(pause)
"Here's a riddle: what's the difference between a sociopath and a psychopath?"
"What?"
"A sociopath is a psychopath having a good day, and a psychopath is a sociopath having a bad day."
(pause)
"Not that funny, I guess."