Pansy wouldn't stop talking about how she hated that you were a half-blood, She would make fun of your father for being a muggle-born. She thought that you weren't good enough for slytherin, all though you did value most of the slytherin traits.
But Draco secretly had feelings for you, he couldn't take anymore of her nonsense.
"Merlins, Pansy. You seriously waste your time talking about her like that, do yourself a favor; do something useful with your life." Draco said, shaking his head.