Historically these people will drop off in popularity over time when they go off the deep end like this. It's true that a bunch of people who thought he was cool before this are, as you suggest, definitely still seeing him as the Top Gangster, but they'll eventually notice he's The Big Cringe and move on. All in all I don't think there's much damage we can do by pointing and laughing at him much anymore.

Besides, maybe if a teenage girl sees this and makes fun of him he'll self annihilate by accident again like with the pizza boxes lol