Who said "If you can't say something nice, say something mean!"?

This quote is attributed to Cartman.

If you can't say something nice, say something mean! - Cartman

"If you can't say something nice, say something mean!"

Cartman Humor

"Screw you guys, I'm going home!"

"I'm not fat, I'm just big-boned!"

"You will respect my authority!"

"Hippies, they're everywhere!"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."