They argue and use aggressive language in front of them. Make them stay in that tiny room for hours and wonder why they won't behave. I'm not assertive. This guy didn't even understand why he couldn't keep MY kitchen scissors in his room without asking. I would have said no if he had.

When I wanted to get rid of my bike, he acted like he was entitled to it. I wanted it gone because it was taking up space and because of who gave it to me. I didn't have to give it to him, but he was enraged because he asked nicely. And he probably has no idea why he can't keep a job.