Yeah, people love to hate fat people, but I swear it's not as much as fat people love to hate fat people. It's like if a skinny person makes a fat joke, a fat person will get offended because they didn't make it fast enough themselves. And this is coming from a thin guy with very low self esteem. I used to think the anti-fat thing was overblown, but fat people happen to get (privately) made fun of the most at my workplace and I think it's because I work with a couple fitness-obsessed individuals. They actually get mad because fat people aren't trying to work out. I don't understand it. I really don't like to hear fat people constantly make excuses for their weight, especially when no one asked. That does get annoying.
Personally, I don't think I've ever specifically disliked someone because they were fat. I've avoided smelly people (which can be related), but having worked with more fat people, I've learned that they don't necessarily have to be stinky if they don't want to be. Also with the exception of one other person, by entire extended family is fairly rotund, so I'd say obesity is likely in my future.