Lets see...Religion, ethnicity and we'll even throw in employment.

Godless heathen (because I'm not a bible thumpin' Christian, or a Koran thumpin' Muslim, or a Torah/Talmud thumpin' Jewish person)
Cracker (more appropriately godd***ed cracker)
Pig (because I have in fact been a police officer)

Have I called anyone by any ethnic slurs? No. Have I thought them to myself? Yes, I am sad to say that I have. The internal struggle with my own stereotypes is a very real thing and I deal with it everyday. I am human. I have watched South Park, and I have laughed at quite a bit of it. Not with the intent of being mean to any ethnic group, but because for whatever reason I have found humor in the entire package. Another fallicy? Yes, and I am human. I don't, however, go out and parrot what I see on South Park (which, by the way, I haven't seen in at least 3 years).

And that still does not make it all right to call police officers 'pigs'.