Most supervisors and managers want to be liked and respected by their employees. Many of us don't have a likable personality; we are not well suited to be supervisors. We either don't have the social skills or we are too impatient or we are too perfectionistic. But, we have the job and we're doing our best.
We're told supervisors who get the highest levels of performance from their employees use positive reinforcement (R+, positive verbal comments about employee job performance). The problems is, positive reinforcement does not work – your efforts to R+ someone are not effective – if you have a poor relationship with the person you are trying to R+. Your relationship with an employee does not improve just because you try to make positive comments about something they have done on the job.