Here's the deal: and I know some of you will scoff at it, FireGuy and Sam, but weight discrimination is VERY real. Both for underweight and overweight, but more so for the latter.
If you are overweight, sure you may not be refused service, but you may be treated rudely and less like a person than a normally sized patron. That's discrimination too.
I know personally from experience (being with friends and family, as I am not married) that if you go to a bridal salon, and you are larger than average, you ARE treated like a second class citizen. They don't try to help you, they don't pay attention to you.
Look in any department store plus size section. Designers don't want to put forth the effort to make cute clothes for bigger women. Most of what you find is frumpy, homely clothes.
Television is full of fat jokes or cruelty to fat people. Bald jokes to a lesser extent. Blondes also to a lesser extent. Compare the number of jokes about a person being overweight to the number of jokes commenting on someone being underweight, I think you would find a pretty wide discrepancy. Even the TV show "Mike and Molly" is a mockery, as it eludes to the fact that overweight people should/will only end up with other overweight people, as if an overweight person couldn't possibly attract a normal sized person.
When celebrities are not thin, they are fodder all over magazines and late night shows alike. Kirstie Alley was treated horribly when she was at her largest. Gorgeous yet plump singer Adele was barraged by rude messages when she gave birth, among which was Joan Rivers indicating that the baby weighed 68 pounds.
Even people who may not be vocal about it or expressly cruel, have inner judgement about overweight people- that they don't have self-control, that they sit around eating a bucket of fried chicken at every meal, that if they don't like being fat, they should just do something about it. When I see a skinny person, I never think, "That girl needs to eat" as I know enough skinny people that eat a ton to know better than that. By the same token, if I see an overweight person, I don't think to myself, "Indulgent slob."
Many people are treated badly because of their weight; maybe they just wanted to bring awareness to the fact that weight discrimination is real to them, and hurtful.