I'm a fairly frequent flyer and have to tell you, I agree 100% with this policy in general. Whether it was applied to him appropriately or not, I do not know.
But in my trip home from Vegas on American Airlines this week, I was stuck in a middle seat next to a man who took up 1/3 to almost half of my seat, no way he could get the arm rest down. It was absolutely the worst 4 hours of my 15 year traveling career. The flight was completely full, so there was no moving for anyone. I honestly had to take a shower at midnight when I got home because of 4 hours of this mans flab and ass laying on top of my leg.
A good friend of mine is a veteran captain on SouthWest and he told me about their policy for big flyers and that it is unique in the industry. I sure wish that policy would catch on.
I'm sorry, I paid near $600 for my seat. I want and have paid for my seat.