Sounds like the cop has a chip on his shoulder. That sucks and probably not much you can do about it. Well, at least I know it was not my uncle since you said he was young
One recommendation for the future...if you are ever pulled over dont reach in your glove box or anywhere else if a cop is approaching you. Just place your hands on the wheel, or if you have tints outside the window. Nothing more will freak a cop out than see the driver reaching for something in the car as he approaches. GL.