Don't be silly.
Acting civil, as sane adults, not like wild animals, would suffice.
Passengers who have anger or other mental issues should not be allowed to travel without a keeper...
Points well taken, but I didn’t mean going to the other extreme and behaving violently.
Just at least attempting to stand up for yourself. After all, he paid for the seat and if I remember correctly, he was told he was chosen at random to let an unnamed ‘higher priority passenger’ take his seat.
Seems to me at least ask why this flight and this particular seat; is there another open seat somewhere. Maybe something can be worked out - as civilized people.