When a cop says “Pull over”, you better pull over. Why argue with him? Not that cops are always right. But they are always cops. You get a lot further being nice than arguing with them over a traffice issue.
Not a fan of cops, but that was stupid of him. I try to say as LITTLE as possible when stopped by police. I stop, give them my drivers license, and if I have a true argument, tell it to the judge.
Arguing with a cop on the road will almost always end badly.