The USA is a signatory to all the ICAO conventions which clearly outline the rule book most countries play by. But in this they seem to make their own interpretation.
If the captain feels a passenger is detrimental to the safety or conduct of the flight, he's within his discretion to address that matter. ICAO is irrelevant on that topic, and presents no disagreement.
I've parked an airplane before, grounded the flight, due to a disruptive passenger.
The pilot in command is the final authority regarding the safe conduct of the flight.