My mother grew up in NYC in the '30s and '40s. Back then each ethnic group had their own neighborhood and people rarely mixed. She lived near a German neighborhood where nazis walked the streets (pre outbreak of war) and all the associated anti-semitism and bigotry was rampant. People were beaten, couldn't get jobs, lost jobs, etc, just for their beliefs. We have moved a long way from that time. The fact that we can complain about a well meaning "bless you" or "Merry Christmas" shows us how insignificant our problems really are.
People that want to live in a world without the potential to be offended should simply put themselves into a coma.
BTW, my mother grew up where a common compliment "That's mighty white of you" was common. She didn't have any clue that this comment had racial origins. No one uses that term today for that reason. I think the same can be said about Vinyl's expression for lameness. Just because you don't understand the root of the expression, it doesn't mean it is PC. Likewise, when one is offended by such an expression, they shouldn't immediately assume there was such malice meant by it. There are friendly ways to deal with that.