There’s never a herd of swine around when you really need one.
Normal people are under no obligation to tolerate insanity. That this defective creature reacts like a tantrum-throwing two-year-old shows he has been getting away with delusional aggressiveness that should have been shut down in no uncertain terms at an early age, and condoning/appeasing it has only resulted in multiple predictable aberrations.
You do them no favors pretending otherwise.