I assumed they were referring to Trevor's IETF posts; the Igoe and Dragonfly comments he posted are about as intemperate as I've ever seen him, in any venue. He is not an angry dude.
Oh! I only read the first thing you linked at first so maybe misunderstood. It does heat up a bit after but only seems 'visceral' in the way showing a bit of ankle is 'racy'. Then again, I don't know anything about the civility baseline of the list or people involved.
I didn't really follow it very far, I did notice Dan Harkins quickly got assholier-than-thou. But there's no shortage of crypto or general tech talk that is worse.