One hated Christmas song I didn't nominate last time around is "We Need A Little Christmas" and anything else that smacks of Muzak.
Someone above mentioned albums they're attached to from childhood; mine are a couple of Great Songs of Christmas albums produced by Columbia Records for Goodyear (!). Favorites on those include the Mormon Tabernacle Choir's Carol of the Bells, Julie Andrews' Silent Night, Eileen Farrell's O Little Town of Bethlehem, and a profoundly moving violin solo of Ave Maria (Schubert) by Isaac Stern. Wish these albums could be rereleased on CD.