I agree that political correctness is choking lots of aspects of our society. But so is downright ignorance and arrogance. Most people put the best manners forward when dealing with strangers and acquaintances. It hurts nothing to hold others to a bit of civility. Like your mom said, "Be nice!" Right before she popped you in the back of the head!
If no intended hard is meant, then no one should be offended. Do these offended people need counseling after they have been offended?