Steve,
I can sympathize to a point but this one line from the story caught my attention > " There was another one for almost $1,000 for driving with a suspended license. His license was suspended in 2011 for unpaid fines, he said, and court documents confirmed."
That's probably what caught the cops's attention and why he laid it on so thick. The law seems to be clear on that point and he was guilty.
Of course, as with any of these scenarios we've only been presented with one side of the story. You'd have to have been a fly-on-the-wall to know what was said, by whom, during the traffic stop.
My guess is the man was less than respectful to the cop. That's never a smart thing. Just a guess however and my take on this.
Tom