Great post over here at ZenMom. I have yet to hear a single, "Happy Holidays." It's always, "Merry Christmas" in my part of the world. I haven't been up to responding with, "Happy Holidays," because I know it will set someone off.
My kids get it, why can't adults? Last year, when some random person wished us, "Merry Christmas," I just smiled and nodded and said, "Same to you." The big kids then hissed at me, "But we don't celebrate Christmas. Why did he assume we did? He shouldn't say that if he doesn't know. We don't go around saying, 'Happy Chanukah,' to people if we don't know if they're Jewish." I had no answer for them because they were absolutely right.
Saying, "Happy Holidays," is NOT an attack on any one's holiday. It's an attempt to show respect for all people and all holidays.
And now I'm ranting. Forgive me. I don't want to raise my blood pressure. I just want to share the link.