It's weird - I've seen this before, with chicks who are bigger or in Meg's case (kind of thick, but she sees herself as fat). It's like the more they dislike what they see in the mirror the more they cocoon themselves from criticism and take on an almost elitist mentality as a way of coping.
I once had a circle of friends that includes a super fat chick, and whenever other girls would talk about a celebrity or Joe schmoe they thought was hot, the fat chick would always be like "No thanks, not for me" as if she could ever have a shot, even.
Meg's def doing the same thing. She doesn't want to post content cause she thinks she's not hot, and doesn't want to see the 1 negative comment for every 10 positive ones. But instead of admitting that (publically) she takes on this air of "people should shell out for my mere existence, whether I post or not"
TLDR - Meg cray.