Given the rash of haters who've been attempting to hijack my comment threads lately, I thought this post from Grammar Girl was especially apt: How to Write a Great Blog Comment. Here's a sample:
Rule #3 -- Be Respectful
I shouldn't have to tell you this, but comments that start out "You're an idiot," are laced with profanity, or are just plain disrespectful, undermine the authority of your argument. Nobody gives much credence to an obnoxious troll. So aside from the pleasure you get from annoying people, you're wasting your time writing such comments.
Check out the video, too. It's a hoot.
P.S. This is not aimed at the 95% of you who make funny, informative, relevant, and/or just plain great comments. I love 'em--please keep them coming! I'm talking about people like The Ternisher or this twit, who just want to rant or make trouble.