Personally, I’d tell this guy that I respect neither him nor the law. Any cop that doesn’t lift a finger to protect unborn babies deserves no respect. Any country with laws that allow the murder of 60 million babies deserves no respect.
Furthermore, any cop that would pull someone over for disrespect, aka exercising the 1st amendment constitutional right, is not worthy of respect. His job is to protect constitutional rights, not use government resources to discourage their exercise.