It's been said before, but it's worth repeating, that a blog isn't a conversation. The blogger links, pontificates, dissembles, or whatever, and if he's feeling froggy maybe he enables comments and/or trackbacks. She's under no obligation to do so, of course. When you pay the rent, you make the rules.
Despite efforts and advice to the contrary, I allowed myself to get sucked into one of the blogging world's reigning permathreads, and quite simply, I got trolled. A certain individual, who notably doesn't have a weblog of his own, pushed my buttons like a maestro in the comments of a third person's weblog. I should have known better -- I've been there before.
If you're gonna pick a fight, don't do it in the comments on someone else's blog. That's like camping out in somebody else's backyard and taking a stinky steamer under his window. It's just rude. Start your own blog.
Perhaps the biggest disappointments were the ones you expected anyway.