There is no "pouncing" going on here.... he has repeatedly been belligerent and accusatory toward posters that he knows nothing about, and others have gently asked him to tone it down, and instead of taking a gentle rebuke, he ratchets up his belligerence. That is beyond a "minor mistake".
Sometimes you have to verbally smack someone to get their attention. I don't know if it will work in this case, but people that come into a forum and try to ride roughshod over others usually get much worse than this.
And, for the record, I'm not "jumping all over you"..... I'm responding to your post.