And always be impartial. Coupled with this must be Christian compassionate. That awkward person might have personal or personality problems to contend with. Try to sort it out, within reason. The Christian manager will also give credit where it is due.
Honest praise is necessary in any work situation.
When my own workers go off duty I always thank them for their efforts, every time. They thus go off duty with a feeling of self-worth and that their manager has appreciated their efforts. Even if I have had to discipline someone, I thank them for their day s work at the end of the shift. This is not a sham. I mean it, because without them I could not possibly get on with my own duties.