Well, if they are being that determined, in my experience dealing with such people, I get my kicks annoying the he-ll out of them by repeating myself over and over again every time they say something. Like, if they ask if you have a g/f or start picking on you or whatever, say whatever you need to say to establish a boundary and then just keep repeating it to them each time they say something to you. Guaranteed to drive them ape-**** and it's a lot of fun, especially if they already question your sanity anyway. They'll go away and leave you alone.

One of my favorite sayings: You laugh at me because I'm different. I laugh because you're all the same.

WW