From Infidel753:
What I’ve learned from experience is that trying to reason with psychos does not work. Trying to debate them does not work. Telling them to go away and leave you alone does not work. Their whole purpose is to get a rise out of you. If you give them any sort of reaction at all, especially if you’re spending substantial time and energy on them and/or getting angry and frustrated, you’re feeding them. And they will not go away.
So I give them nothing. I delete their comments in moderation, I don’t reply to them, I don’t answer their e-mails, I don’t write cryptic-sounding posts obliquely referring to them, I don’t give them any response at all. Once I get their schtick, I don’t even bother to read their comments before deleting. Eventually, un-fed, they go away.
I’ve seen what happens on other blogs when bloggers don’t get this.