Why? Don't get mad. Smile, blow kisses (remembering to blow kisses is a way for you not to get mad, and not to get upset, relax).
Just don't answer. Be quiet. "Am I free to go?"
They want the DL, give them the DL. They want the registration, give them the registration and the DL.
You are doing nothing wrong. You may have committed an infraction or ordinance violation. OK, take the ticket and either pay it, divert it, or ask for your day in court.
Don't get mad. Never lose your cool. Rule #1, relax.
+1 its just a process, except it and then move on your way... No reason to freak out...