OK, after reading 30 pages of comments, I must chime in here...
Police officers in our society are armed authority figures with the ability to detain, arrest, injure, or kill. Furthermore, while not beyond oversight, an officer involved in a physical confrontation, including the use of deadly force, almost certainly begins any subsequent investigation in a more defensible position than the private citizen with whom the altercation took place. Any rhetoric about holding police to a higher standard or scrutinizing their actions without bias may sound good on paper, but when a police officer interacts physically with a private citizen, the deck is clearly stacked in favor of the badge.
This means that when a police officer hits his lights and siren and asks you to pull your car over, it can never be equated with an innocent inquiry from a fellow private citizen. The officer's actions carry the subtext of armed authority that cannot be denied. Because the "request" to pull over is accompanied with the very real message that ignoring the request, using the wrong words or body language when protesting the stop, or even twitching towards the glove box in what the officer can later claim was a "threatening manner" can get you handcuffed, arrested, or shot, the interaction becomes very different than Joe Citizen saying "Hey, cool car! Will you tell me about it?"
No matter the wrapping, no matter the innocent intentions of the officer, and no matter how polite he is, the reality here is that an armed agent of the government, authorized to arrest you if you don’t comply or to kill you if he feels threatened, has just ordered you to stop what you're doing and indulge his desire to know about your personal business, in this case, your car. Stopping and responding with a "no thank you, I'd rather not talk with you today,” even if successful, still means that you’ve been detained and are now asking permission to continue about your business, hoping that your choice of words or your body language don’t threaten or offend, lest you face an arrest for disorderly conduct.
As soon as a person puts on a gun and a badge, the inherent disparity in authority means that every interaction with the public carries very different implications than two private citizens chatting. Part of a law enforcement professional's job is to recognize the subtext that accompanies their authority and always act accordingly. A traffic stop to check out a cool car just plain wrong (and creepy).
And if you’re okay with being detained so he can check out your Tesla, how could you possibly complain if he becomes intrigued by your bumper sticker and pulls you over to question you about your political views or your religion or your sexual orientation? Or if he just decides you’re cute, with his innocent request for you to pull over carrying the ever present threat of arrest unless you comply? Or if he stops your child at at the mall and asks her to explain the shirt that she’s wearing, simply because he finds it interesting?
No matter how you dice it, he’s still saying “Stop, citizen, under threat of arrest and with the risk inherent in our interaction, and answer my questions.”
The right to make that demand must never be abused.