In spite of her assertion to the contrary, she IS a size-ist jerk. If she weren't, she would also be complaining about how television implicitly promotes murder, rape, adultery, and a whole slew of other things that are much more harmful to society than obesity. She is picking on fat people because, unfortunately, they're one of the last groups in society that it's "OK" to hate.
Not all people are physically attractive, whether it's because they're obese, or elderly, or just weren't fortunate enough to be born with attractive features. (I suppose she thinks those people shouldn't have intimate relationships either.)
Get over it. There are more important things in life than how someone looks.