Perhaps rather than asserting your rights (especially if you don't have a camera recording it) you could say things like "Even though I am not legally required to comply to the best of my knowledge, you will punish me if I do not, correct?" or even "Since asserting my rights will be construed as suspicious, I have little choice but to comply, is that correct officer?"
Basically the idea is to subtly use language to point out to the cop that he is basically being a tyrant without being antagonistic. A lot of cops are just trying to do their job and don't think too deep about the big picture.
In some cases you may even sympathize with the police and say that it's terrible that they're being required to violate people's rights because of the stupid laws being passed that don't do much besides make their job more difficult and dangerous.
I haven't tried any of these, but I'm just thinking I'd have better results doing something like this than a more direct confrontation.
"Sometimes it is said that man cannot be trusted with the government of himself. Can he, then, be trusted with the government of others? Or have we found angels in the forms of kings to govern him?" -Thomas Jefferson
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