It's the holiday season for folks of many different backgrounds. Hanukkah just ended yesterday and Kwanzaa will follow Christmas on December 26th. In our PC based culture, we have given in to the generic salutation of "Happy Holidays" when when we greet strangers. I don't have a problem with this, but not for the reason you may think.
I think we're become way too uptight. While my greeting of joy will always be Merry Christmas, I don't care if you return the favor with Happy Holidays, Happy Kwanzaa, Happy Hanukkah or have a nice day. This is a season of joy to be shared by all, not a time to get caught up in petty differences.