Okay. Am I The Asshole If I Call Out My Roommate's Self-centered Behavior? I Live In A Communal Space,

Okay. Am I the asshole if I call out my roommate's self-centered behavior? I live in a communal space, where everybody except C shares freely. C got a good job through connections and is able to spend freely on themselves, spending little on household items, groceries, etc. They say they're broke every month, but I've seen their takeout containers and amazon boxes, so maybe it's a spending problem. Worst of all, when we are low on food, C just disappears for a few hours and comes back instead of cooking with everyone.

I've told C that they're being selfish and they should start considering other people, but it goes in one ear and out the other. I offered to help budget but they don't listen! They barely spend more than $400 of their $2000 a month on groceries for the house; the rest goes to their lavish lifestyle while the rest of us suffer. I just want them to pay their fair share. AITA for asking them to be fair??

Including some more specific INFO from version 1 of this post (which wasn't postable due to being about emotions rather than actions):

What are these acronyms?