Bullying is more than an occasional loud comment in a situation where the employee has made a mistake. It is a continuous lack of respect of the employee by someone who is abusive. One of the reasons that we do not currently have laws against bullying is because it is so hard to define. What is abusive or bullying to one person may be just considered a minor annoyance to another.
Bullies tend to overreact to any error or perceived error of others. Bullies carry a grudge or annoyance due to something done by others, or something the bully perceived was done by others, for much longer and at a much higher intensity than what normal people do. Bullies will use demeaning or curse words when talking to their victims. Bullies think nothing of embarrassing their victims in front of others, even to the point where it makes the bullies look bad.
A bully will not allow the victim to state his or her side of an issue; it is the bully’s way or nothing. Bullies tend to take credit for everything that is right and place blame on others for wrongs that the bullies have created. Bullies have little or no empathy for anyone and can single-handedly destroy the morale of a hard-working employee, department, or even an entire company.