Should a citizen obey an obviously unlawful order from a cop? And because a citizen doesn’t comply should that citizen as a result be beaten, tased, shot and killed, or thrown in jail?
I think this case is an example of when libertarianism meets reality. Which is why I tend not to be libertarian in practice, only in theory. (at least in some ways)
To answer your question directly, “Yes, anytime a police officer gives you an order, you obey”. Why? Because of what happened here. As we all know, many are on a power trip, and thus feel personally threatened if their orders are not obeyed. So, one can be either a good little libertarian and “fight the power that be”, in the process most likely getting your @$$ kicked, or, one can be “wise as a serpent yet gentle as a dove” and get justice where it really will only matter: in the courts.
Either that, or we are talking about advocating anarchy (as well as getting one’s @$$ kicked).
Of course not, why to even ask? That's why the law uses the term "a lawful order" - to make sure that licking the LEO's boots is not part of the deal.
The deputy might have been on a power trip, but he had a right to regulate traffic. His orders to that effect were lawful - even if incorrect. The proper place to challenge that is called the courtroom, and the chances of winning there are far, far greater than at the roadside.