No one wants a bad colleagues. But we sometimes forget our colleagues feel bad. By using words that do not respect. Do not treat me like a colleague when a colleague is not working well. We might accidentally say that "I do better," though no words to demonstrate dissatisfaction. But listeners will recognize that his work was not satisfactory. Words such as this not only hurt. But also destroyed the friendship at work, too. Denying the wishes of his colleagues. Will affect the long-term work. If not avoided, you should use words that will make us look bad.