Having recently experienced such rudeness from an employer, I feel fully justified in recommending tit-for-tat retaliation from employees. Holding to human standards of decency is no longer warranted when your employer no longer views you as a human being.

Given the behavior of my current company towards all of its employees, I am looking to go elsewhere, and when I do, I won't worry overly much about burning those bridges behind me. The at-will sword is two-edged, so let the other guy feel the backswing occasionally.