"Then he proceeds to tell me that I was open carrying and that my gun was in a holster and that partially conceals my gun so I was in violation of open carrying laws???"
He states this knowing you have a cpl? Yup lack of leo knowlegde. Also shows that he is clueless in that being in a car you are carrying with your cpl anyways and not OCing. You should tell him to get back to you when he finds said oc laws