I heard an interview with him and he said that this critic was badmouthing all of his work for years. He felt personally attacked by this, as he said she'd not talk so harshly about other plays or people, but always criticized everything he did. Then he saw her in the theater, she said something snarky, and he just snapped.

So I still think this guy is batshit crazy, but at least he doesn't seem to swirl around shit at every bad review.