I swear, you Jasper apologists need to have a reality check.

Jasper was the literally the one trashtalkign everything that had been made on Earty, she was the one who gave the speech about every gems needing to be suited for their purpose in the Homeworld(s hierarchy and how the ones that didn't fit needed to be exterminated. Jasper is all about perfection. Skinny doesn't look like how a Jasper is supposed to look, so she is a mistake, trash in her eyes.

This is her canon point of view, no matter how you look at it.

Too bad canon Jasper would actually been the one bullying Skinny, since she completely looked-down on Amethyst for being "overcooked."