Agree with the 1st nine words of your 1st sentence and that's it... I'm as polite as can be, even when repeatedly being stopped by cops that lie about the reasons they stop you. So annoyed that I thought of ways to record a live view of the travel lane, dash board, speed and maybe even some OBD stuff, dump the last 10 mins of video and data off site on demand for just this reason. Then when the trooper says, you forgot to signal your lane change, you can politely say, "Officer, I believe you are wrong and we can certainly check the video if you would like to discuss it further."
This guy was not providing his ID, which he is not required to do. If you simply believe that the cop "could have done some things better", and you don't blame him for doing all that so he can make sure he went home that day, we are in very different camps.