Tactful form for speaking, avoid from disrespect,familiarity are obligatory demand by office etiquette.

 And he is not cancelling and when a need to share a satisfaction and to critique.

An art for to do remarks is a thin art. And its need to have a not just a manager, but any member in collectives, or in a big or less level will rate work for friend, and insist for young to study are fewer experiences.

 A remark is need to be a true by essence , competently, constructively, that to understand, what is wrong done a worker and a how to correct mistake. And here need to find any form, till good-natured joke , and  easy irony form, and avoid to humiliate dignities for whom , is directed critique. 

Causticity, rudeness, rewarding by absurd epithets are insulting  and leading goals are worsely , that remarks  done in correct form. Person s insulting is perceived, and he is needing in self-protection, in restoring, in restoring infringement feeling of  self-respecting.And,  on this emotional form negativity perceiving a not just a form, but a essence for what is about here a speech. Dominating staying a wish opposing, rejecting for obediences, but not get into it content.