There is the law of what we believe should be and then there is reality.
He wasn't being "forced" to exit because of a seatbelt ticket. It was because he was digging like a terrier through his man bag.
We really need an INGO traffic school thread.
If he was "digging like a terrier through his man bag," it was because the officer demanded ID - something the officer had no right to do. Even if the officer intended to cite him for a seatbelt violation, all he is legally required to do is to provide his name and address for the summons.
Regardless, reaching into his bag was in direct response to a demand for ID; therefore, it is unreasonable to believe that he was reaching for a weapon. Further, he found and produced the form of ID he was searching for - at which time, it was plainly obvious that he was not reaching for a weapon. Thus, the demand for him to exit the vehicle for "officer safety" was unreasonable. The officers were not at reasonable risk to their safety.
And that doesn't even get into the unnecessary escalation that the police officers engaged in, without provocation, including placing spike strips under the car's tires, and surrounding the vehicle with multiple officers, ostensibly for a seat belt violation.
And in the end, he was (apparently) only cited for "resisting law enforcement" - which, absent any other unlawful activity, sounds like a police-state, contempt-of-cop type of charge if ever I heard of one. Unless the officer has RAS that he has committed an unlawful act - and given that he was not cited for any such act, separate from the "resisting" charge, we can assume no such RAS existed - then he was under no legal obligation to do anything the officer told him to do (that pesky Fourth Amendment interfering again).