A while back, I posted about thin privilege. I've had at least one person try to deny thin privilege by saying essentially, "Just because you are discriminated against, doesn't mean that I benefit from it."
Many of you just had the logic circuits in your brains overload. For those who don't get it, though, I will try to explain privilege, and how it affects everyone, for good or ill.
If the world is predominately run by people who regard a characteristic (in this case, fatness) as a reason to not hire someone, throw rocks at them, give them bad service, or otherwise treat them badly, then the people who do not have the characteristic (thin people, in this case) directly benefit from this situation by having reduced competition in all things. Thin people get included, while fat ones are excluded. If you don't consider being included in the "possible employee" pile of resumes to be a benefit over the people whose resumes go into the circular file based solely on the fact that they are fat, then I'm not sure how much plainer I can make this.
You also benefit by not having to carry the burden of being discriminated against based on your weight. If I need someone to believe that I am hardworking, smart, efficient, or experienced, I have to work twice as hard, because I first have to overcome the immediate perception that fat people are the opposite of those things. It is also believed that I am not entitled to desserts, or sometimes food of any kind, or taking the elevator, or being in a wheelchair. A thin person who is using any of those things is not questioned, while a fat person is judged negatively for doing so.
I'm not telling anyone that they should feel guilty for being thin. I am suggesting that we should work toward a more just society, and that starts with the individuals. When you find yourself in a grocery store, and you see a fat person using a motorized cart, think about your immediate reaction. Lots of people think, "Maybe if they would walk, they wouldn't be so fat." Some of them even say it, usually as anonymous online forum participants. Stop yourself, if you think that way, and consider the fact that you don't know that person, you don't know their history, and it isn't fair to judge them. Think about whether you'd judge a thin person the same way. Then ask yourself why a thin person is assumed to have a real disability, while the fat person is judged as lazy, and too stupid to know that walking is "healthy"?
Keep yourself honest. Be aware of the way you think, and aware of the things you may or may not gain from your privileged status as thin, white, male, wealthy, or whatever else gives you that advantage.