Yeah, most of them are there to do a job. It takes a special type of cop to put-up with mouthy perps. Cops have seen all manner of insanity with degenerate subculture types, and I'd imagine they have a sigh of relief when a stop goes well. I have two acquaintances who are cops, one state, one local, and they are outgoing, funny guys. Normal human beings by any standards. Fortunately, I've never met one on a power-trip, and hope not to, on the road, as my wife says my mouth and smart-ass comments in that situation would work against me.
Although when I've been stopped (rarely), LEOs seem very stand-offish, and with good reason. They don't want to end-up dead.
I watch Bad Boys, and Cops, and the funniest thing I've seen is a stop where the driver yells and screams about the ticket, tears it up, throws it out, and the LEO tells him to step out of the vehicle and pick-up the pieces, or he will be cited for littering. The guy is still shaking and yelling loudly, picks up the pieces, and peels off into the sunset. The LEO watched as the vehicle was tear-assing away and said, "have a nice day". All caught on the dash-cam. Brought me to tears!