When diaspora Jews celebrate Christmas by omitting all references to baby Jesus, etc., leaving only the fun pagan stuff: trees, presents, songs, TV specials, egg nog, etc....
Q: "Hey Seth, why does your family have a Christmas tree? You're so assimilated!"
A: "Back off, Ari. It's Judeo-Christmas. We had Chanukah too. Don't be all super-Jew with me."