It is mean to criticize people
Chris is working with two new hires at his job teaching them the routine at work.
Chris wants to give the new hires performance feedback.
Chris gives the new hires feedback based on very low standards set to accommodate for the learning process.
Chris tells the new hires that he thinks they are both terribly incompetent and that he dreads working together.
The new hires are eager to improve and work hard towards becoming fully trained at work.
The new hires both find Chris's behavior to be unacceptable and unfitting of a manager and go to HR together to report him.