The F.C.C. requires you to identify at least every 10 minutes, and at the end of your conversation, in plain English. This additional ID helps guard against unauthorized use. Also, the repeater controllers need a little time to get the DTMF decoder ready to accept your input, so giving your ID first, helps insure you have the controller's attention before you begin dialing. If you rattle off your call sign so fast that it cannot be understood, you have failed to properly identify, and your call may not go through. These failures have often been blamed on malicious interference when in reality either the controller was not ready, or the call was disallowed because the controlling party had failed to identify in an understandable manner.
Amateur radio is a family hobby.
New licensees tend to pattern their operating habits after what they hear on the air, and many of them are not even teens yet. Language that is acceptable at a bar or truck stop is often unacceptable on Amateur radio. The food there really tastes like crap.