I am not offended when someone wishes me a "Merry Christmas", nor when someone says "God bless you" or offers me their prayers. I take it in the spirit in which it is offered, that someone wishes me well, and holds me in their good thoughts. How could I be offended by this? The more good wishes going around, the better. I mean the same thing when I tell someone "Blessed be."
What bugs me is that here you have a group, who's beliefs are plastered all over everything, who dominate the winter season from pretty much October to Jan, and they're crying "Help! Help! We're being oppressed!". Oppressed? Because other people have stood up and said "You know, it's not just you. Some of us have been celebrating winter holy days since before Jesus was a twinkle in his mother's virgin eye." You have got to be kidding me. It's not about excluding Christmas, it's about including the rest of us.