Sarcastic Remarks

Smart-mouthed colleagues  normally struggle with their own insecurity and believe that sarcasm helps them look better to others. I would normally put myself in the smart-mouth's shoes and identify myself with that person. When they sense that  l understand, it helps bring their guard down, preparing the way for an easier confrontation.

I would confront smart-mouth individually rather than address the team as a whole. Smart-alecks may not be aware we're referring to them when addressed as a group and the non-jokesters may not appreciate the association with the guilty party. Smile, be calm and give an example of a specific sarcastic remark and how that made one feel when one talk to the offender. I would continue to do my job with confidence and show kindness to the smart-mouth. Perhaps the smart-mouth will learn a thing or two from my own professionalism :-)