"You kicked my chair." Draco insisted because yes, he was not letting it go. That act of war would not be waved off. He was violently attacked and he was justified in what he was doing. And yes, perhaps a little put out that Snape was being so harsh on him. He had been for a while now... maybe he thought like the others did at home. The death eaters didn't seem to much care for him and his family.

"I was hoping this year, you wouldn't come back." A boy could dream. "No one wants you here, Potter."