Why is being overweight a touchy subject?

Samisrad
Why is that whenever an overweight girl gets made fun of for being overweight everyone jumps on the "body image discrimination" bandwagon, BUT, when a naturally skinny girl gets called anorexic, bulimic, malnourished, disgusting, repulsive, or is being told to "go eat a sandwich", no one cares.

These are both forms of body image discrimination!

Why does everything seem to think that skinny girls aren't discriminated against?!
Why is being overweight a touchy subject?
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