While there are lots of things that you can do legally (evidently having your proof of insurance on your phone is now one of them), why would one want to do things that intentionally antagonize the cops? If you're going to do something different, then you're going to have to explain that and likely have something that says that you are right. Should that be necessary? No, clearly. But do you want to cause a cop to question your validity? The courts have given the cops wide latitude in evaluating threats and probable cause. They need to as there are infinite scenarios and cops need to make evaluations in split seconds. Why cause them to evaluate something outside the norm?