I had a very similar problem, and I have bad news and good news.
The bad news is: The person can follow you and make unprovoked references to you all over the place.
Additional bad news: In order to prove without a shadow of doubt that you are not feeding their frenzy, you shouldn't respond to any of it. (Not easy!)
Because this is a peaceful place, for the most part, the first two or three seperate times this happens, it is best to really try to make peace with the person. Tell them what they are doing that is bothering you, and really try to listen to their response. It may not be purposeful. You may even agree not to PM each other--and may even have to take it upon yourself to rise about the fray, and not respond to any of their baiting, or their posts. This, while not great, is better than placing yourself in a position to take partial blame for their behavior.
If you have extracted yourself from all response to them, and they continue dragging your name all over the place-- send three or four links of their unprovoked personal attacks to a Moderator. Its crappy to bother MODS--but when you feel you've exhausted your energies in trying to handle it yourself--and the negative, personal attacks/references continue, unabated, and you are silent--I don't see any other recourse. This method has worked to my satisfaction.
I really like the members, like Montana, who try to eat a meany up with kindness. Sometimes, this does work! And, sometimes, when I've done this, I was really happier myself. Maybe I hadn't realized their intent wasn't as mean as I had imagined, and was thankful I hadn't taken it too seriously. This type of behavior may cut off a 'stalker' situation before it happens.