Why many people/girls hated other girls who were thin and skinny?

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Why many people/girls hated other girls who were thin and skinny? I myself is a thin girl for some they already see me skinny, but i eat a lot. But why there are some people or maybe only girls hated girls like me? they say many bad things such as anorexic, there maybe some girls who become skinny because of being anorexic and dieting but not all.. there are still some people who eat healthy and eat a lot but still thin because that is already their body frame. I am so bothered.. because of that it made me feel insecure of myself because of the discrimination and hate we get for being skinny or thin.. I remember my classmate in college before, she said i'm so thin that's why i don't get a boyfriend :( that made me cried a lot, and when i got home i went straight to the kitchen and food a lot of damn food on my plate and eat all of them... since then i never see myself good.