Dear Frostbite
I believe it is also due to the fact that the a/c has used the wrong frequency.
Numerous times we have all heard of people on the wrong freq. To some the radio is a daunting piece of kit that takes experience and confidence to make your r/t perfect. In the open FIR the use of the radio can be abortionate. However I believe that a pleasantry con certainly help those not used to the radio become more proficient.
Except..."Over and Out" I detest the morons who use that.