Break the cycle and ask for a Supervisor. Next best thing is if you are under arrest. If not ask if you are free to leave - if yes ask to be hooked up and taken to a magistrate for a PC hearing. Also trying to determine if it is a Miranda stop or a Terry stop. Most cops these days do not even know the difference but in most States it matters a great deal.
Oh, last time I went through this I was about twenty. None of the stops I've had in the last ten years has gotten that confrontational. That was in the early seventies and you had to watch your step or you'd be face down. Texas DPS has been remarkably good about hammering the speed traps. There used to be a town north of San Antonio called Selma, and it was a legendary Texas speed trap. DPS hammered them and last time I went through the court house had become a Hooters. No joke.
One funny thing. After I got my CC permit, when these small town cops pulled me over, I'd hand over my permit, they'd ask me if I was carrying, I'd say yes, and they'd relax. Concealed carry people are a lot safer to be around than most people, so cops know they're not at risk. Despite the aggravation I feel when getting pulled over, I wouldn't want to do it for a living.