I spend my Christmas money on Christmas presents to give to people at Christmas and if some can;t say that then they don;t take my money.
Simple.
I see all the time Hannukah mentioned, I see other holidays mentioned.
Christmas is a federal holiday, if one wants ot be a gringe then so be it but they do not get my money.
I have had Jewish friends wish me Merry Christmas, and I wish them Happy Hannukah, knowing full well that H. is a rather minor Jewish holiday historically. The important thing is that a good wish is friendly.
Strange that I have never had a Muslim wish me Merry Christmas.