I used to be the 'she should just go eat a cheeseburger' person...mostly because I'm not comfortable in my body. I started to think about how hurtful those things are to say to someone and I'm training myself not to any more. It's also a bit difficult to do, since those of us on the slightly other side of the spectrum are potrayed in the media and slovenly and out of control with no care to our health. For good or ill, very thin folks are the media norm as we are bombarded by the 'ideal' feminine form. Until that perception changes, I imagine both negative comments and stereotypes will be rampant.