To be honest, I don't find them to be a problem, nor do they bother me in my every day life, but when I am forced into situations like that it makes me realize how much I despise the obese and lazy. I suppose I have also developed a pretty significant bias from seeing these types of people every day in the hospital. they are disgusting.
To Eheath: I see where you are coming from, and those are not the kind of people who bother me. It's the people who just blatantly disregard any sort of hygiene, well-being, or health, then judge people for having a negative opinion of them. The kind of fat people who will elbow you out of the way when you fight for position in your own goddamn space to begin with, then tell you to show respect, or the girl on Facebook who posts shit about how she's proud of her body, but eats 14 Big Macs per week. Blegh.