For the record, A.C. Douglas gets it wrong: I did not post his comment, then delete it and repost an edited version, in order to put on a show or have a fit of pique. I assume that he's attributing to me what he would have done in my place.
What actually happened was that I was out running errands, saw the comment come into email (smartphone, yes), and clicked the Publish link without reading the comment carefully enough. Twenty minutes later I checked it again, saw the name-calling, and thought "Oh, shit." I deleted and republished when I got home. It's that simple: reading too fast and following the usual routine.
It's nice that he's gotten some supportive email. I have too. :)
And it's fine that he's not posting further comments here. His stance a few years ago was that he doesn't have comments on his blog because he claimed that bloggers should reply on their blogs, not in comments. This hasn't kept him from taking advantage of others' comment sections while keeping comments disabled his own blog. Make what you will of that.