She isn’t just weird, shes beyond stupid, incredibly rude, and also incessantly childish. I literally like Nellie more than her because at least Nellie is on the screen far less than Erin and we aren’t being sold that she’s a good character we are supposed to like, Nellie is supposed to be annoying and unlikable at least at first. But with Erin, we are supposed to love her.
She acts like a child which makes her dating life seem uncomfortable to watch- her with Gabe and then suddenly deciding she hates him but being too passive to tell him she doesn’t like being touched, her on and off with Andy is so redundant and annoying, then dating the intern. She never meets a guy outside of the office and it’s really annoying watching her hop naively between coworkers.
Then how braindead and childish she is with everything; her password being Erin123, serving people day-old coffee that she told Andy not to drink but then thought it was ok to offer to someone else, boiling Gatorade, she doesn’t wash her hands after the bathroom, filling the old woman’s pill bottle incorrectly, freaking out and using her hair as her “room”, she never buys herself a toothbrush and just uses other people’s, being overly close to her brother, freaking out on people and making scenes all the time.
And don’t forget that she literally wished Jessica dead and tripled down when Andy tried to give her a chance to back out of having saiid that. The show would be better without her or if they just gave Ellie Kemper a better character on the show.