There are good (insert title here) and bad (insert same title here). Bosses, husbands, wifes, partners, lawyers, cops, judges, (insert religion here), (insert political party here), (insert worker of (insert store here)), driver of (insert make/model here) vehicles.
When you're not in a position of authority, you probably don't want to piss off the person that does have authority. Sometimes you can complain and there will be people to back you up (a good judge), then again, it could make things worse (a bad judge). If you want to take a chance, go ahead, just don't complain to me when it bites you in the ass.
Every time I've gotten pulled over I was nice to the officer. It has helped every time.