You might as well be a blackman driving a powdered doughnut, brother. Cops love to hand out citations for expired tags and no proof of insurance. It's their way of "connecting" with the plebians. Besides that, it is the only adamant proof that you have broken the law. Being unaware, forgeting, etc is a typical excuse and cops revel in that shit.
Perhaps they are pulling you over, citing you, and fining you on their way to bust some meth dealing serial killer molester.