Oh, stop being so depressed and Anti-Christmas. Just enjoy yourselves, please!
Remember, if you feel too old for it, then at least try and make it fun for the teeny weeny little kids....and if there's no kids around, then just do whatever you want, but don't be miserable.
If you have family, eat with them, and have a good time.
If you're a religious Christian, then go to Church, enjoy the service, and greet the people. If not, then go out with some friends and get wasted (note that this also applies to religious Christians as well- I don't want to be discriminating now :O)
If you don't have any friends, then just go out and get wasted regardless.
I'm sure you get the general idea by now