"You only hate fat people to feel better about yourself" ...so? Let's think of reality TV. Why are shows like "Hoarders" or "Worst Driver" or "My Strange Addiction" so popular? Because when people watch them, they can think "wow, at least I'm not that fucked up." No one thinks it's wrong if someone watches Hoarders to feel better about their only slightly messy home. Similarly, when I feel bad about the way I look - thin people have their insecurities too, unlike fatties imagine - seeing a fat person makes me think "wow, at least I didn't make myself a walking blob of jiggly butter. Maybe I don't look that bad after all." I have always paid attention to maintaining a healthy weight, so it is perfectly okay for me to remind myself of the things I've done right when I'm down by seeing those who were too lazy to do the least.