Let me give you a quick analogy:

I rarely speak to my boss. She leaves me alone to do my job, and I don't normally tell her what I'm doing, or when I've done it. I don't ask to take time off, I either notify her the night before or the day after.

Ocassionaly, she will call me with a request. Usually it is something of great importance to my employer. But she phrases it as "Can you", "Do you have time to," "Please," etc. And I take the "request" and treat it just as I would and order from a commanding general.

It's about respect and dedication. How the command is verbalized isn't important. Shouting and screaming really only work for children and immature people.