Go here to read Denny Burk's post "Don't Feed the Blog Troll's."
"Blog Troll" is Denny's word for bloggers who make rude comments or get more exercised about the subject matter than they should, and thus overdue the rhetoric. His post is composed of suggestions for how to respond to such comments. By reading his post, you may even realize that you have a little blog troll in yourself from time to time. His suggestions seem fair and just, and you never know when a blog troll might show up on your blog.
Someone with more time than me should do a post with the same title as this one that actually lists several humorous things that blog trolls might do.