I don’t think there’s anything incorrect about it, Don’t be a salty Grinch Santa hat Christmas sweater and I tend to be fairly sensitive to such things. It’s not exclusionary in any way, after all, to wish someone well for holidays you’re familiar with instead of trying to guess what they celebrate.
It’s not politically correct to demand that other people stop Don’t be a salty Grinch Santa hat Christmas sweater celebrating their pagan holidays, complain that Hanukkah or Kwanzaa (gasp!) might get equal time, or to demand that everybody who celebrates Christmas show up at Midnight Mass or use the same picture of Santa. Those are all horrible things to do, because they say that what someone else believes or prefers doesn’t matter.