These are all surprisingly good points, especially the last two. Fundamentalist Christians seem so fixated on making sure that the entire Christmas season is 100% about them and that no one else ruins it. Even pagans, who originally owned the holiday. And then we get idiots complaining about Starbucks cups or the phrase "happy holidays" or secular music in those choir concerts that happen right before break. It's like, you do realize that you're not the only people in this country (or others, for that matter), right?
I grew up in a fundamentalist family and have always been astonished by some of my relatives' level of self-righteousness. According to them, Christianity is the answer to everything, and literally everything else is evil and demonic. It's ridiculous.
That being said, as an agnostic (with some new age beliefs), I'll probably always celebrate Christmas. It's too hard not to when my SO and I both grew up celebrating it. If not, we'll switch to the winter solstice. The idea of snow, wintery food, brisk air, and chilling by the fireplace seems like a pretty decent reason to celebrate.