"You can call him an idiot all you like – that’s fair enough. But there’s nothing wrong with Potter’s mother being Muggle-born," she said defensively as she turned angrily to face Draco, making the Gryffindor pair gape at her in astonishment. "That’s just racist. It doesn’t mean you’re any less a witch. I mean, I’m Muggle-born, and it doesn’t stop me being good at magic, does it?"