Can you cross your legs?

I mean I can since my legs are slim but...this girl in school that been bullying me for being slim screamed at me and my friend because we can cross our legs. She can, "I can't even cross my legs with my fat ass legs but you skinny bitches can! Gain some weight! Guys don't like skinny bitches."
She isn't even fat. She is just thick. Guys like thick girls so why is she hating? We called her out a few times.