I'm not the one who brought it up, I'm only disagreeing with an argument that was presented to me. The entire post hinges on an agreement that she is skinny. And yeah, the post is rude. I normally never comment on people's body out of nowhere, and I never even cared about her weight in the first place.

I don't know how you can say "her face isn't part of this conversation" when the conversation is about whether somebody looks skinny or not. You brought the camera angle argument up and her face is furthest from the camera, yet it's still not the face of a skinny person.