I have spent Christmas alone every year for more than a decade, I don't think YABU as I still dislike/dread that time of year, mainly for that reason. It's all very well to say ignore the hype - but in reality it's almost impossible to do that - shops full of Christmas goods and Christmas music, internet, papers, mags and TV full of Xmas ads, everybody at work going on about it.....
I would agree that volunteering can be a good idea eg helping to cook/serve a Christmas dinner for homeless (and puts things into perspective). Going away also helps - even just if in the UK, when younger I went to the Lake District one year and London another and stayed in YHA hostels so not expensive. Can be expensive to fly abroad at that time of year though.
But it is one day, which soon passes so you can also treat it as a normal day at home (maybe with some nicer/posher food and wine than usual, I never bother with turkey and other Xmas food though - don't even particularly like turkey). Binge watch Netflix or whatever. Works for me (to an extent - still feel happier/relieved once it's over though).