Yes I can. I am free to withhold my business from stores that censor the word Christmas - - even though everybody knows that it's Christmas shoppers that they're selling to. I predict you'll see more and more organized efforts, even boycotts, by Americans who are tired of the politically correct censorship of the word, Christmas. Just as the anti-Christmas bigots and the PC police are free to try to censor the word, the rest of us are free to complain, and to punish them at the marketplace.
And those boycotts really seem to be working. Sorry, no business is under obligation to tell you what they call their office parties or allow you to dictate what they do.