2) Girls call someone sweet even though to any man of average intelligance the person they r calling sweet is not sweet nor smart and is in fact a total arse.
3) You're gay and have just been called sweet
4) Girls call dim/stupid people sweet for some reason, I only wish I was dense as two short planks.
5) If girls dont say it to the guy but to his mates the they quite obviously fancy him.
6) Only girls eva say this.
"awww how sweet"
"awww aint that sweet"
Has similar meaning to some definitions of soft or gay and its other homosexual-based slang
Possibly regional, at least endemic to certain parts of North or Northeast Philadelphia.
"she's really upset!"
"you could show more sympathy"
"sweet, anyway... more importantly, suck me off"