I can read, yes, which means I also didn't miss other stuff instead of laser focusing on one line at the very end.
Because she says she "doesn't like him", but that’s what she says, not how she acts. Throughout the entire get-together, despite her proclaimed dislike, she consistently shut down her friends from bothering the guy, and then arranged events so he and Charlotte could get a romantic moment. And then literally after she says she "doesn't like him", she still gives him the advice to stop dwelling on the past and focus on the fact that there is a girl right now who likes him for who he is.
Her actions and words do not line up for someone who supposedly doesn't like the guy and that seems very deliberate. Given the entire context, it seems obvious to me that what she means is she doesn't like his self-sabotaging attitude rather than having an actual hatred of him.
Yet people called her a bitch despite her not doing any bitchy stuff, aside from, at worst, teasing both leads, and that's not a crime. Reading comprehension means understanding the context of what is written, not take just one line at face value, but nah, that's clearly that's too much work, better to base our entire judgements on first impressions and one lines.