Lucius Malfoy was never the type to be kind to anyone that he thought wouldn't make him gain anything.

Much less a filthy mudblood. He hated everyone who he deemed less. As a pureblood, he figured it was his job.

He expected his son to do the same. So when he caught you leaving Draco's room, he was appalled.

"Who are you?! How did you get in?'