I Hate You, You're So Skinny

When I was in ninth grade a classmate said to me, "I hate you, you're so skinny". She may not have intended to be mean, but I heard, "I hate you because you are skinny and thus we can't be friends". That experience taught me that people are judgmental and that I needed to be careful about what I said around people who weighed more than me.
I don't understand why society dictates that thin is beautiful but then criticizes women who actually are. I have heard many statments over the years and not one was actually complimentary. It bothers me that people feel it is okay for them to say truly negative things, such as, "What are you, a size 0?" or "Let me get that (big object) for you, you might hurt yourself." or "You're such a little thing". I have tried to talk to people about this and their response is just not satisfactory to me. They tell me that the people who say these things are trying to be nice and just don't know how to say so or that they have their own weight issues and what they say is a reflection of them and not to take it personally. My rebuttal is thus: we don't say mean things to fat people or atleast we know it is not socially acceptable to make critical statements to people who are clearly overweight, so why is it okay to say things to thin people?
Recently the media has had a field day with new pictures of Tyra Banks. She was a successful model and now we are tearing her apart for gaining an average amount of weight. She is reported to weigh 160 pounds, but she's 5'11" tall. Give me (and her) a break! Her body shouldn't be any of our business and if we are going to pay attention the least we could do is commend her for being healthy.
Another media field day surrounded the Terri Schiavo case. As this story made headlines, bigger issues became apparent, but the fact that Terri had an eating disorder was swept under the rug. Terri's control over food began long before she had a feeding tube in place. Her husband even won a malpractice suit against the doctors for not recognizing that she had an eating disorder. Maybe if society would stop obsessing with women's weight, healthy, thin people wouldn't need to defend themselves and the rates of eating disorders would decrease.