I want to agree with you, but I've got the nagging feeling that it may be technically true, but realistically not.
For one thing, I know that in some states, the cops are allowed to detain you for short periods of time, and during that period they are allowed to ask you certain specific questions such as who you are, what you are doing at the time and where you are going. What I don't know is if you are required to answer the questions, particularly the last two. What I do know is that if you don't answer the first one, they can detain you for as long as it takes for them to identify who you are. I don't know if there are any consequences to not answering the other two.
When you are under detainment, you are required to comply with their orders. That doesn't mean you have to answer their questions, but you do have to do what they tell you to do, as long as their orders are "lawful" (I'm not going to get into what should be done if the orders are not lawful). AFAIK, orders like "Please roll down your window" and "Step out of your car" are lawful orders, and a detainee is required to obey them. If you don't, the police are allowed to use force to get you to comply