Yes, I am comfortable reprimanding employees if they engage in behaviours that have a negative impact on the company. It can be awkward, but it is necessary if someone refuses to perform the job properly since his or her performance is a reflection of your managerial aptitude. I believe a minor infraction warrants a warning. An intermediate infraction warrants a write-up. If an employee fails to improve or commits a serious infraction, termination or suspension may be considered. I have never had to discharge an employee on those grounds, but I have had to issue warnings and write ups.