The best kinds are insults disguised as compliments.

“I hope your day is as pleasant as you are.”

“I can’t tell you how much I enjoyed your presentation.”

“You never cease to amaze me.”

“I am sure that with enough determination, you can make it to the top of the bell curve.”

“If we were sat on a bench together and someone came up and said ‘One of you two is an idiot’, I wouldn’t think they were talking about me because I don’t take offense easily”.