Their boss is unfair; the workload is too heavy; the benefits and pay aren't good enough; they don't have a nice enough office; so-and-so didn't deserve that raise...and so on.
This malcontent spreads his or her negativity like germs in a nursery school. They lie in wait in the break room, ready to pounce on unsuspecting employees who come in for a cup of coffee or a donut; instead, they get an earful of just how awful it is to work for this company.
Unfortunately, this kind of negativity is a powerful thing. Before long, the malcontent army has grown, and they become the majority, poisoning the workplace environment with their dissatisfaction.
So what do you do if you're an employee who finds satisfaction in their work, who agrees with the policies and procedures of the company, who has a positive outlook, and who actually likes their job?