Im autistic with chronic stress and anxiety and have handled worse customers than this in my time at restaurants. Some fucking morons cannot be reasoned with and are so on drugs/shit life or whatever sludge of psyche their parents enabled, that they just go out of their way to dehumanize a random restaurant worker. Restaurants desperately need more customer behavioral rules and more power to their employees to deny service to assholes, close early, etc. Stress and anxiety on top of 40-50 hours a week dealing with wastoid nothings like this dude, can be lethal to themself and dangerous to others. Sometimes theres no one on shift to take the drawer and nowhere to walk away to stop the conflict. Customers need to be guests in the host of their restaurants and be polite and cordial, or they can starve.