Hermione hates that he chose to be a traitor first when the Order was right there, and hates that despite that fact, he never had a choice in the war or where to place his allegiance first, just like she never did either because it’d been predetermined far before she had any say otherwise. She also hates that he’s still a traitor, even if it means against Voldemort because that means he is a man with no loyalty except for himself—and that makes him untrustworthy. It makes him dangerous. 