(CNN)Most of us behave like a jerk at times. The stresses of today's fast-paced society combined with a national epidemic of sleep deprivation can turn anyone temporarily toxic.
How to handle the adult bully in your life
That's ok if it's not a habit, experts say. It's frequent boorish behavior that can become contagious.
"Bad behavior is actually more contagious than good behavior," said Robert Sutton, author of "The A--hole Survival Guide: How to Deal With People Who Treat You Like Dirt."
"So if you walk into a situation where there's a bunch of disrespect, it's hard not to catch that behavior," said Sutton, a professor of management science at the Stanford University School of Engineering.
But turning from Jekyll to Hyde occasionally does not make a person a bully. What does define a person as a true bully, Sutton says, is if they regularly make you feel "oppressed, humiliated, de-energized or belittled."
The brutish actions that often lead to those feelings, Sutton said, include personal insults, teasing jokes, threats, public shaming, rude interruptions, invasion of personal space or uninvited personal contact.
Preston Ni, the author of "How to Communicate Effectively and Handle Difficult People" and a communications professor at Foothill College outside San Francisco, has identified five types of adult bullies who use different techniques to inflict harm.
These bullies use their formal power, such as being a boss or executive at a company, or material power, such as having legal authority or control over finances, to intimidate others.
Power is a dangerous thing, Sutton said. "If you're an a-hole and a winner, you are still a loser as a human being in my book."
This type of bully shames and insults with words, often expressing constant criticism or using hostile teasing, Ni explained. Sometimes the language can be sexist, racist or homophobic, and can be threatening.
It might not sound like bullying, said Ni, but in some ways, this method is the most cunning. This type of jerk behaves nicely