Oh how I love this. Girls were always extremely mean to me growing up. Now I almost cry every time my son steps onto his bus. I'm terrified for my children to have to endure mean people. And I hope they never have to. Be nice! Children learn by example.
The role of a manager is to ensure that others bad attitudes do not infiltrate the workplace and make everyone unhappy. It is as easy as telling the person to check their attitude at the door and to leave it outside!