Roast Whipping Post

For someone to diss you/mock you based on a characteristic of yourself, your personality, clothes etc. in front of a lot of people

Example of a Roast Whipping Post:
Teacher: Ok Class, that's the bell everyone is dismissed. Stacy, please see me after class.
Stacy: Why? Can't get a date for prom?
Teacher: If that was the case I would've asked one of the pretty girls.
Class: DAYUM!!!!