I saw this at the time, but reading it again now what struck me is how coolly his correspondent responded, without escalation, hurt, or resistance; and no-one else chimed in to confront the attitude. In other words, this kind of aggression was acceptable. It's a real sign of how things have changed--for the better. As you say, Linus has since made strides, and it's not as if he was the only one; I used to do it too (if not nearly as egregiously) until various people I respected called me out for it. Now I shudder to recall what passed for normal 20 years ago.