"Here’s the thing about jokes. They only work when they’re aiming up… People in positions of power simply cannot make jokes at the expense of the powerless. That’s why, at a company party, you never have a roast where the CEO is roasting the janitor (“Isn’t it funny how Steve can barely feed his family? This guy knows what I’m talking about!” [points to other janitor]). Because that would be GROSS, and both janitors would have to work late to clean up everyone’s barf."
Lindy West, Jezebel