You shouldn't be rude toward employees.
Dave who is a manager of an office sees that Phil, an employee is doing a bad job.
Dave wants to say something to Phil about his work habits.
Dave tells Phil that he notices Phil is having a hard time at work and offers to give Phil a coaching session.
Dave tells Phil that he is a moron and that his work habits are awful and that if he doesn't pick it up he's gone.
Phil is delighted that someone is going to help him acquire the skills needed to the job properly.
Phil is angry at Dave for being so harsh and at the same time insecure and worried about his job security.