What I find funny is people complain about us not saying, happy Ramadan and such, and that we should say that instead of Merry Christmas...well if we only say theres isn't that the same thing except switched? And don't say...say "happy holidays" and it will solve everything.
Holiday Tree? damn, now thats confusing...I thought a Christmas tree was a symbol of Christmas not the holidays...are we going to say, look at the Holiday Chanukkah...no, obviously not. the Chanukkah is part of Hannaka, and I wouldn't expect it to be called anything else.
So guess what, I say celebrate what you celebrate but don't try and get other people to stop celebrate what they are celebrating.