Passive-aggression at work is bad for everyone involved. It's not very different from yelling or bullying. But what about when you insult co-workers, with no intention of doing so? An objective examination of behavior, not intent, sheds light on how this happens, and how you can prevent being misunderstood.
Prefer to work alone? The modern workplace is probably pretty hard on you. Most companies emphasize teamwork these days, as requiring employees to work together is believed to encourage collaboration and increase efficiency and creativity. The good news is that you don't have to a natural team player to see some benefits from (occasional) teamwork.
It may seem counterintuitive to build teams that include multiple people with narcissistic personality traits; these folks tend to want to be the center of attention and in charge. However, if you want to spur creative thinking and problem-solving in the workplace, this is exactly what you should do.