She's not a sympathetic figure.
But that cop had should have had many other ways to respond to her instead of joining into the childish argument.
In fact, at one point she says she'll comply, she'll sign the ticket. The cop could have said, "Fine." and moved over to the side of the road. But by then he is rather stuck on the fact she doesn't think he's god.
He's stupid and fat, has no business being a cop if he can't control a situation like that except through a taser.