I don't endorse the adjectives, but the basic approach in this seven-second video is hard to beat:
Under slightly more serious circumstances, this response is solid:
I have enormous sympathy for cops who are trying to protect and serve. I have very little for cops trying to meet a quota—they should be taking quotas up with their union reps. I have none for cops who're harassing people because they're bored or they want to try to impress somebody back at the station.
ETA: Yes, recording the encounter is helpful. Check on your local laws about recording cops. That there are any laws anywhere against recording cops doing their job is obscene: public servants should not have anything to hide from the public.
ETA 2: It's Perfectly Legal To Film The Cops. But there are states trying to change that, and cops who won't tell you that.