Listen, even if you were a child raised by feral rednecks who didn't teach you shit about manners and hygiene, the basic "cough into your elbow instead of your bare hands, at the very least; and if you do cough into your hands, go wash them before touching things" is still something you should be picking up as an adult who interacted with adults that were raised by civilized people, in environments such as college and a corporate workplace. Not being raised right is one thing, but Anna's inability to pick up on unwritten social rules well into adulthood unless people directly point them out to her, is baffling. It would make sense if she were a literal autist, but I'm pretty sure she's not. She's just pathologically self-absorbed and has an IQ that's just barely above what would be considered clinically retarded.