Simply because we don't say some kinds of punctuation.
It always struck me as a "war on 'Xmas'," where Xmas itself was pretty much okay (with a few limitations--public creches, for instance) but you mustn't call most of the public displays of celebration by its proper name.
No "Merry Xmas." Only "Happy holidays."
No "Xmas tree." Just a "holiday tree."
No "Xmas break." Just "winter break."
No "Xmas songs." Just "winter songs." Or "holiday songs." Even the religious ones.
No "Xmas parties." Just "holiday parties."
No "Xmas decorations." Just "holiday decorations." Or "winter decorations."
So where I work we can put up lights, have trees, decorate them, put up fake pine branches, have the occasional party, but under no circumstances were they "Christmas" anything. This struck me as unbearably silly. Only because of a Texas law (that'll almost certainly be ruled unconstitutional on some petty grounds) can they now be called "Christmas."
Full disclosure: I don't celebrate Xmas and, personally, find it all a distraction from useful things. As long as it doesn't affect me, okay; mostly I just wish it would go away.
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