Originally Posted by
BadgerBoi
To summarise your argument; FA lies to Captain in order to have passenger removed.
It is possible that the FA lied. But from the moment the captain stepped back, the passenger is on thin ice. In this hypothetical, he wouldn't be removed because the FA lied. He would be removed because the captain asked "are you going to comply with the FA's instructions" and the passenger argued with the captain.
Off he goes.