Well these discussions always upset me. I think everyone is worthy of love and everyone is attractive for some trait - it may be their bodies, it may be their eyes, it may be their smile, or their kindness, or their strength.
If I lined up my boyfriends from the last 20 years it would be an amazing array of different looks. My tallest was 6' 9", my shortest is my now DP, who is the same height as me (5'5") I have dated skinny rakes and extremely well upholstered men.
What they all have in common is some kind of magnetic x-factor. They are all men who attract other people, who are sociable and the life and soul of a party all have been kind and giving. It is no coincidence that a few of them have gone on to be well known on tv or radio or in journalism and music - because I am attracted by charismatic men.
Luckily for me, charisma is something that remains despite what happens to a person's exterior as is kindness and generosity. I find that sexy - i honestly do!
I think to say fat people are disgusting and to snigger behind their backs or be incredulous that they 'let themselves get that way' is spectacularly missing the point about weight gain. If it was just a matter of will power, I think the many thousands of strong, intelligent, able, determined people who struggle with their weight would be able to lose weight easily. There are biological and psychological factors involved in weight that are far more complicated than 'eat less, move more'. That is an incredibly simplistic view.
...and to be disgusted (disgusted?!) by overweight people is a really awful, mean spirited and nasty reaction to have. Fair enough, don't have sex with an overweight person if it personally bothers you so much (although I fear you may be missing out on some great experiences - being good in bed has so little to do with physicality and lots to do with feeling and skill), but don't call them disgusting or laugh or judge.