The reality is that if you are very fat, you need to think about booking an extra seat if you travel by air. You can’t simply assume that you will fit in your seat. The reason “humiliation” occurs is because heavy people deny reality and book only one seat. Coach class seats are small even for people who aren’t obese.
ever have an extra ticket at a football game and have your extra seat occupied by half of someone else who thinks its just extra room?
One of my employees was pretty heavy at one point. On the rare instances when she had to fly, she booked 2 seats, even paid for the extra one herself.