That's the equivalent of blaming any European for the Holocaust or any Muslim for terrorist attacks or any eastern European for car thefts or any other stereotype you can think of. I mean isn't this what the whole thing is about? Abolishing stereotypes? I'm all up for that, but trying to abolish something by actively using it seems really counter-productive to say the least.
As I previously said, I've had encounters with horrid police officers, regardless of my polite manners. But I'm also aware policemen are people with the exact same problem like any of us. I see something deeply hypocritical in the whole situation(and the many similar situations across the world over the years). Truth be told I only know one police officer personally. And the truth is he is one of the kindest people I have ever met, despite being utterly strict in his work. Now given the opportunity to choose between rocks flying his way and people calling him a dirty pig or playing with his 2 year old granddaughter in the evenings, which one do you think he'd rather pick?