Unpopular opinion but kill em with kindness. They have a job to do, probably feel overworked and under appreciated like the rest of us and most people don’t have what there supposed to when they go to the dmv. They are in charge of issuing legal documents and if you don’t have your paperwork right like most people, you would also lose patience after years and years of it. If you can find a quieter location they have a tendency to be nicer.