Title VII's broad prohibitions against discrimination specifically cover "hostile environment" when the hostile environment is motivated by animosity based upon sex, race, color, national origin or religion (the same prohibition applies under different legislature for age, and disability).
Generally, the action of the few ignorant, arrogant or obnoxious employers that is not motivated by the "supsect" classes referenced above will not supprot a lawsuit.
In the event that a person has made false statements defaming another's character, there may be a cause of action for defamation/libel. Finally, keep in mind that unless you complain about one of the suspect classifications, your employer may terminate you for complaining, or for no reason at all(called at-will employment).
