That's a misunderstanding, if you act like a buffoon the police are required to treat you as one. There not dictators, just blue collar workers doing there jobs.
There's hours of video online of American police screaming "stop resisting arrest!", while beating civilians senseless.
It's quite clearly a tactic employed by a lot of them to create plausible deniability of their appalling behavior.
Selection bias, you see the videos that outrage you the most well you don't see the day to day reality. Police don't beat calm sensible people, they beat the kind of people who are out there resisting arrest.