Clearly, the driver did not obstruct the officer's ability to issue the citation. How did the driver, REASONABLY, endanger the police? They KNEW the identity of the driver, they KNEW the car was registered by the driver because the cop that made the stop reported the plate to dispatch before engaging the driver. If they felt any fear at that point, the perhaps they should seek another profession.
I disagree, he exerted his 1st Amendment rights to voice his displeasures of his interactions with the police.
Also, it would have been a nothingburger had the cop just issue the citation.