Yes, we buy into it because as consumers we can't escape the commercialization since its everywhere we go. Christmas carolers at the grocery store. Christmas wreathes and trees in every retail store and gas station and school and hospital and home and church. There's no escape! Like that Rowdy Roddy Piper movie, "They Live!" (it's campy as hell but the screenwriter John Carpenter was brilliant the way he jibed how we're all prisoners of commercialism in society). The movie is a commentary on Reagan's America of the 1980s that is still relevant today. It tanked at the box office because its relevant message was not one people wanted to be reminded of: the rich control our country and the rest of us are indentured servants.

And all commercialized (religious) holidays have been mythologized and the lines between the original religious reason the holiday was created to the maniacal commercialization of said religious holiday in order to exploit it to boost retail sales. More horrifying than a Steven King horror story.

My Christmas activities revolve around gorging carbs and sweets and watching movie marathons and posting online.

I think it's awesome that you want to volunteer on Christmas day. You may want to contact food shelves and homeless shelters and churches to see where you can join their volunteer staff.