OK.
> 2. Shut down the standardmarkdown.com domain, and don't redirect it.
Don't redirect it? Seriously?
> 3. Apologize.
This guy is actually a prick.
EDIT: OK that was unfair. If I was in Gruber's position, maybe I'd be angry, and maybe I would have demanded an apology; it doesn't make him a prick. But the "don't redirect" thing seems petty.