I have only had a couple of incidents where a police officer has been "emphatic" with me.
The first was my fault. I was young and got pulled over for running a red light. I wasn't wearing my seatbelt, so I thought to avoid a ticket, I would just get out of my car when I stopped. Not a smart move. That's a good way to get a gun drawn on you. Suffice to say the officer explained why it was not a good idea, and I will never do it again. Didn't get the seatbelt ticket, though.
Another time happened just about a year ago in Florida. I was driving down a little county road, and I entered a town where the speed limit dipped from 55 to 45. I was slowing down, but the officer got me going 53 in a 45. I was maybe 50 yards past the speed limit change sign. I was not rude to him at all, but he started by asking me "Why are you in such a hurry?" I told him I wasn't in a hurry, but that I was just slowing down to the speed limit in town. I explained that I was not from the area, and that I didn't know the road at all. I think I said I was sorry about 6 times. He immediately started getting ticked off at me, and was like "Oh, I can tell you're from out of town." I was in a rental car, and when I told him that my proof of insurance was in my briefcase in the back seat, and that I would need to get out of the car to get it, he told me that he ought to "run me in" for wasting his time. Finally he let me get out of the car, and get him the proof of insurance. He ended up writing me a ticket for speeding. When I finally got to my destination in Gainesville, I mentioned the incident to some people that I was meeting with, and they all laughed. I guess this particular town has pretty well known speed trap, and they get people all the time. nearly everyone that I talked to about it had also received a ticket in the same place.