Nobody's forcing anyone to celebrate it. If it's not your religion, or not your preference to celebrate it, or you just want to be left alone, then don't celebrate it. The movie theaters are still open on Christmas day, go see a movie with all the other people who don't celebrate the holiday.
I don't get it, people grouch about the day being so bad, but the degree of grouching makes me think they really do want to celebrate it, but for some reason are denying themselves all the fun. Either you don't consider it anything special, so should just treat the day like any other day, or you do want to celebrate it, in which case stop being so grumpy about it and just let loose and have fun.