This is ridiculous/you have no idea what you're talking about. Was the guy supposed to act the same after being turned down and come off as clingy/creepy?

I think being on the internet too much has led you to forget how the real world works, you see someone you like, you start a chat and if they show interest the dynamic continues, if they don't you readjust and act accordingly in order to keep them from feeling uncomfortable around you.

There was absolutely no bum behavior showed by this guy.