I am absolutely appalled by some of the hatred you people are spewing.
You've just proved to me that that the last socially approved "ism" is "size-ism".
You would never dare say anything like the crap you are espousing if it had to do with the person's race, colour, religion, age,etc. You people have absolutely no compassion. Weight gain creeps up on you, and it is very hard to lose it. I've been up and down in weight all my life, and let me tell you, the old joke "I may be fat, but I can lose weight, but you'll always be cruel and stupid" is amply demonstrated by some of the posters in this thread.
The airlines are to blame for this. They have reduced the width of the seats, and the pitch, and have crammed all of us in like cattle. Seats 30 years ago, even in economy, seats had a width of 22", and a pitch of 35". First class back then was 26" width, and a pitch of up 54". Today, economy is 17-18" width, and 28" pitch.
As a large person, I often pay for and fly first class just to avoid assholes like you all, who can only afford to fly economy. What the airlines should do is offer more seats like in first class/business, but without the free drinks and slightly better meal. Offer comfort, and you'll get my business.