"A lifetime"?! If the bar had been really disturbed by him the owner would have blacklisted him. Bar patrons will be different on the nights he shows up so it isn't likely the same patron has to ensure his off key singing too much.
Most of all, getting violently attacked by a trained pro fighter ad subjected to a potentially fatal knockout easily outweighs by far his annoyance value. What he is doing isn't illegal but what schilling did to him is abhorrent from a moral perspective, a criminal act and a grievous civil wrong.
You should reexamine your values if u think schilling is entitled to assault people who annoy him.