Well, Draco admitting that he'd done something wrong - well as much as he'd admit it, that was different. But Millicent wasn't about to give in. He hadn't learned his lesson and she was sure of it. If he ever did anything, it was because it suited him. Not because he wanted to or because someone else had asked him.
"You know what you'd have to learn," she said, ignoring the fact that he was trying to flirt with her. "And if you don't, then you'll never know."