All I can tell you is my own personal experience. Half are assholes, the other half are cool.
If you encounter an asshole cop, just keep cool and do not escalate the situation.
If you don't like that the cop is giving you a ticket, take your arguments to the judge when you appear in court.
Good luck with that. I have a university police force of greenhorns next to where I live. Got a ticket for an illegal turn that wasn't illegal. Had to go to court and explain traffic law to the judge and the cop. Ticket was upheld and I had to pay the fine but it was removed from my record a week later. Thanks to me and at my expense the memo got out and now everyone makes that same turn without consequence. Judges can be egomaniacs.
Got stopped three times on my bicycle. First for no light, second time for a bike light he didn't like (which I subsequently removed to save battery costs) and again for no light.
Got ticketed for being 200 yards from my home without my drivers license even though I knew my license number by heart. Ticket was upheld by the judge. Began driving slowly and methodically through that jurisdiction to prevent any future tickets and I was ticketed for driving too slow. Judge upheld that ticket, too.