Best definition
you’re sweet
an insult to a guy if siad by another guy.

Bill: you’re sweet Ted!

Ted: Fuck you Bill
you’re sweet: define #2
You’re sweet
An extremely offensive term used to degrade some one other than yourself. Similar to “you’re cool,” You’re sweet is intended to irritate and provoke the recipient with obvious sarcasm.
Bob: Hey Chuck, sorry but I just drank all of your beer.

(This irritates Chuck)

Chuck: You’re sweet bro, you’re sweet.

You’re cool sweet cool irritate provoke