There's a huge difference between misusing their power and not having perfect understanding of what they're allowed and not allowed to do.

I'm sure there are scenarios where the cop can confiscate the surfboard and the car. The distinction is probably somewhat vague even for highly educated lawyers, and cops cannot expected to be that.

He should have stood up for his rights, sure, but laughing in the cop's face and telling them they're full of shit is disrespectful, and at least where I live is a misdemeanor even if the original case is wrong.

As a citizen, when I have an incomplete understanding of what I'm allowed and not allowed to do I have every incentive to stay on the side of things I'm sure I am allowed to do. Just threatening to do things that you are not allowed to do has the annoying tendency of being a crime

I'm not sure how this suddenly flips for cops