I once worked as a temp in a office where there was a young woman who was a real trouble maker. Every interaction she had with her colleagues involved her jibing at them in some way, and whenever they got annoyed or upset by her behavior she would say, "I was only joking! Don't take it so seriously!"

One day, when it was just me and her in the office, I leaned forward, looked her in the eyes and told her: "I think you're a trouble maker." She then kicked up a big fuss, and complained about it to ayone who would listen when they came into the office. True to form, she was being a drama queen.

But one day, a senior member of staff desperately needed her help with something. This senior person was getting a little bit impatient with her, but nothing too bad. But once the senior person had left the room, she burst into tears and said "what a bitch!"

So, it just goes to show - she was nasty to other people all the time as a form of defence mechamisn, because underneath she was secretly a delecate little snowflake herself. This is usually the case, actually. People who go round being being aggressive towards others are using that behavior to hide their insecurities. People who are happy and secure in themselves never feel the need to bully others.