"Cruelty, Civility and the other Weighty Matters" Paulin

In Paulin's "Cruelty, Civility and other Weighty Matters", she refers to "overweight" people as "fat". I think she does this by implying that if, in society's eye, if you aren't thin, you are fat. Its one or the other. As people we don't allow ourselves much leeway when it comes to judging people on their appearance. The word "fat" really disgusts Paulin. She had developed a bad connotation to that word. She feels that people are cultured into feeling that they need to be thin to be successful and happy. She even exemplifies this in an ad she saw for Slim Fast. A women had been quoted in saying "she felt ugly when she had gained some weight during her pregnancy", but after the birth (with a kid playing in the background), she states "Slim Fast is the best thing that ever happened to me". Wouldn't you think her new child would be before that?