What he "should have done" is just stand up in his seat prior to departure. When the obligatory "you must sit down sir" direction arrived from the cabin crew, he should have merely replied "I have been trying to, but the seat I paid for is currently occupied by other passengers. What are you going to do about it?"
Then the rent-a-cops would have been called in to smash in his face, teeth and skull. He then would have been able to launch a law-suit, which would of course be quickly settled out of court to the order of 8 or 9 figures, and he would never have to fly economy again. Problem solved.
That's how we solve customer complaints in the 21st Century. Not many passengers complain. For those that do, it's cheaper to just physically assault them and then pay them out until only the compliant proles remain.
Last edited by Derfred; 5th May 2017 at 14:41.