With how unprofessionally aggressive the LEO was being, it wouldn't surprise me to learn that the driver was afraid to say ANYTHING, let alone try to refuse consent to search. In fact, the few times he DID try to respond, the officer shut him up, cursing at him, manhandling him, and calling him a liar.
Not disagreeing with you at all. Just stating my observations.
I also think the defendant talked to much, but this is just my