I'm not Chad, but here's some food for thought.

The issue isn't whether or not he could sue you. Anyone can sue anyone for anything, regardless of whether or not there's any merit to the lawsuit.

For example, I could file suit against you for $100,000, claiming that you've wronged me in some horrible way. I wouldn't win, but if I had money and wanted to be a dick, I could drag out the proceedings, force you into discovery, file a bazillion motions, and you would be forced to pay an attorney to defend yourself or else just default and allow me to get a judgement against you. It's evil and fucked up, but that's the way our legal system works.

So with regard to your website against your neighbor, if what you said was factual, was protected parody, or opinion, and did not violate his rights of personality and publicity (if your state recognizes those) then he might not have any grounds to *recover* against you, but he could still file suit, cost you tens of thousands of dollars in legal fees before you managed to get the case dismissed or won at trial. And there's no guarantee that even if you won, that you'd get your legal fees back.

So... as tempting as it might be, I would think you'd be best advised not to do what you're speaking of.