I received an apology from the irate customer I wrote about in this thread!!
How long has it been? Long, eh, since the incident happened.
He'd been back plenty of times. Always super polite since last time. Well, he asked this last time for a few minutes of my time. And he goes into a rather lengthy apology.
I accepted. Gave him the apology he deserved as well. He seemed sincere.
It was cool! Felt really good.
Another point for humanity's decent side.