Max Blumenthal writes that this absurdity has its roots in Anti-Semitism. Because you know who really hates Christmas? The Jews:
Unlike their more respectable counterparts, Brimelow’s writers dared to name the true anti-Christian Grinch: Jews. The winner of Brimelow’s 2001 War on Christmas competition, a “paleoconservative” writer named Tom Piatak, insisted that those behind the assault on Christmas “evidently prefer” Hanukkah, which he called the “Jewish Kwanzaa,” a “faux-Christmas.”Which makes perfect sense; nothing offends a racist like showing basic courtesy to someone different from them. Saying "Happy Holidays" instead of "Merry Christmas" implies that you can't assume some random person on the street is Christian. That doesn't strike me as particularly scary or bad; but for the Christmas Warriors, it's the end of the world as they know it.