Fat and personality....?

Has anyone noticed that a fat woman can have a certain personality and we like her, but when she loses weight that same personality is unacceptable for a thin woman? Star Jones, Nicole Richie, and the same would be true if Rosie O'Donnell lost weight. They can be rude and bitchy when they are fat and it's funny, but a skinny woman has to be kind and nice or everyone will hate her. (Nicole Richie was just chubby, I know, but you get my point).