Would it be ok if I tell a guy that he was super hot but I don't want to date him?
Are you trying to trick him or something?
It's to hurt his feelings. Why would I date someone I didn't like?
I'd say he'll appreciate the compliment, but you're just being cruel. Leave him alone.
I didn't like him. I was just trying to be nice but he should have ask me out.
You're toying with other people's emotions and bound to get caught. There are other ways to fool around and tease people without hurting their feelings. Be creative and come up with pranks that are less harmless.