Every now and again at work, everyone comes across a person who it seems is going out of their way to make your life more difficult. When things begin to go wrong they revel in it, even if it will make their life more difficult later on. Anything that goes wrong is someone elses fault and they will accept no responsibility. Anything that people suggest is a stupid idea even if it is a method that has worked time and time again.
In live music, teamwork is one of the most important skills you can have. The ability to get along with people is as important a part of getting people to trust you as having the skills or the experience. There's no place for massive egos when you're working as part of a team, where anyone can make a mistake and it will effect the running of the event.
Being an arsehole is counter intuative, and to everyone around you, makes you look like the fool, not to mention unexperienced.