Shop etiquette is different depending on where you're working. Some shops are pretty laid back, others not so much. The idea is to recognize your place and how you fit in. Sometimes you'll deal with some difficult people. Sometimes you're the difficult one. Either way it becomes part of the shop dynamic. So learn to live within your surroundings and you should be OK. Here's some useful links for you.
EricTheCarGuy Channel: http://www.youtube.com/user/EricTheCarGuy
Dealership Polotics: http://www.youtube.com/watch?v=wwfp0dyylqA
Should you get into auto repair: http://www.youtube.com/watch?v=x9oFqDoV22Q
Workplace dynamics: http://www.youtube.com/watch?v=7w1hvueCVA0
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Shop Etiquette -Etcg1