My favorite anti-Xmas song: "Christmas is Pain" by Roy Zimmerman, from his album "Comic Sutra." He does an hysterical Bob Dylan impersonation, and the lyrics are spot-on - here's a sample:
There's a turkey a gobblin' out in the yard
Now he's gutted and stuffed and he's basted and charred
And your father is whistlin' and washin' the blood down the drain
Christmas is pain
There's a crowd on the hillside with hatchets and saws
With a keen disregard for the forestry laws
And they happily hum while the stumps slowly bleed in the rain
Christmas is pain
And the stockings are hung by the chimney with care
As if anyone in their right mind would hang 'em there
And some tired old crooner is croakin' out carols again
Christmas is pain
And you wait for an hour to see Santa Claus
And he's covered with velveteen, bourbon and gauze
And he pinches your mother and she can't find the words to explain
Christmas is pain