Why are people who weren't nice, suddenly greet you as if you're best friends?

I can only think of a couple people that weren't nice in HS. There was a guy who had a habit of making bad jokes about disabled people or those surviving from cancer, was the class clown and thought it was funny, even when others weren't laughing. He was an arrogant, rotten person.

I was at a restaurant with a couple friends recently and suddenly the jerk comes up and says ''Hi all, nice to see you my friends, what's new? My male friend interrupted him and replied ''I don't remember being friends with you. You were a total jerk in HS''.

He then got offended and said ''What, still butthurt. I was joking. I thought we were friends''. Have this ever happened to you before? Someone that wasn't nice or even a bully, suddenly greets you as if you were best friends, as if nothing ever happened? Why do they do that?

Why are people who weren't nice, suddenly greet you as if you're best friends?
Post Opinion