A recent incident on a United Airlines flight has sparked debate about bathroom usage policies. An economy-class passenger used the first-class lavatory due to a drink cart blocking access to her own cabin's facilities. The 1K elite member, who was using the facility at the time, had an "absolute meltdown" when he saw the economy-class passenger. However, the flight captain intervened, reminding the 1K passenger that the aircraft belongs to United Airlines, not him.

Source: https://www.wionews.com/trending/elite-traveler-goes-bonkers-at-seeing-economy-passenger-use-first-class-lavatory-769945