Some employees are natural complainers. They can and will find something to gripe about, no matter what. If one of your employees fits that mold and files incessant EEOC or internal complaints, how you handle those can mean the difference between a mildly annoying pain in the neck and a lost lawsuit. How? Chances are, chronic complainers won’t be able to make a solid case that they’ve suffered discrimination. But if you decide to punish her, she may have a retaliation lawsuit.