I think people using Christmas as an excuse for gross overconsumption & greed to the point they are beating each other up at department stores is far more offensive than whether or not some minimum wage drone wishes me "Merry Christmas" or not.
(Not that I necessarily have anything against gross overconsumption or greed, mind you -- it's just that Christmas shouldn't be the linchpin)
I agree. Christmas is now about consumption, not the birth of Jesus Christ.