I once had a guy give me that line on a stop. I told him that I catch a lot of "real" criminals on traffic stops, a lot of times people with warrants.
He made a "pfft" sound and said I was lying, and that I don't get wanted people by stopping them for what I pulled him over for. Like it was scripted, the dispatcher broadcasted that he had a FTA. I laughed all the way to jail.
Reply to "real criminals"...................
"Well, you were here first...........and the real bad guys drive very carefully for a reason...."