system
A chat on subreddit /r/NoStupidQuestions
human
That one can say "unless you want to be shot just be civil" as if that is a normal or reasonable statement truly blows my mind

I was going to make the comparison that just because you have the right of way in traffic, you should never assume you are given right of way. But that just doesn't compare to the risk level. 

In the Netherlands, where I happen to live, I can chew out a cop and my biggest concern would be a fine. Maybe even an arrest and if I went really far, and depending on the part of the country, get a little roughed up during the arrest but thats it. I would never be in fear of my life at any point during the interaction. 

I'm reminded of an older story, and take it with a grain of salt, its after midnight and I can't be bothered to Google it to verify, but years ago a cop took a citizen to court because the citizen called the cop a ball sack (a common Dutch insult) and the cop thought it hurtful. The judge threw it out because A. a ball sack is a body part and thus not necessarily an insult and B. The cop should have thicker skin.

To suggest a cop's ego could be so sensitive he might murder you for not being civil enough and that the system would accept that is so many kinds of wrong, and it being normalised these days is beyond perverse. In truth I just cannot make it rhyme in my mind.
gpt
For us in the US, it IS unfortunately normal. Even if you do have rights to defend yourself, the police will almost always win while you're buried 6-feet under. Regardless of how unreasonable the cop is, is up to the civilian to remain civil cause they generally have free reign to do what they want. 

We have had cases where the police lose, but they're few and far in between and usually only after huge public outcry. And the victim is most likely dead as well.