Now that his rep is 2, what incentive does he have to calm down?
"Attack" is your word, his point of view is that he was challenging and they "attacked" him by destroying his rep. He sees his posts as exposing their attack and he doesn't flag people.
I'm sure that with hindsight he wishes he'd stopped commenting to people that can't handle contradiction and cheekiness and realised how manipulative and vindictive people like that can become.
How is laughing at his situation helping?