do we, or dont we

Sometimes i think we attach too much importance to ourselves.Deep inside,we feel like some omniimportant being bound to command respect all the time.I guess i have the same problem at least.Yesterday when my manager sent an email across saying we were not supposed to chat and listen to songs while working on cases ..i had some colorful words for him in my mind along with the phrase "welcome to call center..now everything will be banned except for thank you for calling ",but some minutes later ,I asked myself,was he wrong ? Is doing your work with concentration self-depreciating ?Is saying something as a script insulting ? Its not .Either i attach too much importance to myself,or i dont understand the actual meaning of the word self-esteem