I also don't like Christmas Day, OP.
One of my best friends mother died on Christmas Eve a few years back, and we rallied round to support her and her two DC through it at the request of her DH (her DM had been seriously ill for a while, but her death was still a massive shock to my friend and her then quite young DC, and her - actually very lovely - DH literally didn't know how to support them all through it alone. So he called in the troops.). Ever since then, myself and our other best friend have made a habit of putting aside an hour or so on Christmas Day to call, or Skype with her so that she can remember her mother (whom other friend and I both grew up with in our lives) and cry without it impacting upon her DC's day too much.
My own parents don't understand why I do this (loudly, and repeatedly barging into the room I'm trying to hide in and bitching at me), but... I know my two friends would (will) be there for me when they die, so I grit my teeth and carry on. Plus it gives my parents a bit of one-to-one time with my own DC... they live 10 minutes drive away from us, but don't tend to spend any "quality" time with my DS at all. They can't cope with his "issues" apparently (he has AS). Christmas Day is the most time they spend with him all year, and if I can escape for an hour to encourage that? I'll selfishly do so.
Now that my DD is getting older, she's less interested in spending time with family and more attached to texting her friends all through Christmas - which can be difficult to deal with. I know there will be at least three arguments concerning her attachment to her mobile before dinner's done with that day. My parents will squabble and bicker like spoiled children. My DS will have at least one meltdown due to the tension and over-stimulation. And I will spend much of the day longing for the day when I don't have to deal with parents and/or children (for one day, they will have their own children and partners to be spending the holiday with, and I will resolutely not inflict myself upon them, even if my parents do!) and can simply lock myself into my home and do what I want to for a change. I will also spend a vast portion of the day missing the sanity of my DP and wishing that he were there simply so that my parents will be on their best "we have a guest" behaviour and, well, behave like adults and not school-children. But he'll be with his own family at the other end of the country (as he should be!). My DC's father refuses to have them for Christmas as he, too, is with his "new" family and our DC are a nuisance of a reminder to his DW that he had a family before they met.
My two best friends and I have plans for the Christmas Day when we're all 50. We're going away somewhere that we can pretend Christmas doesn't even exist, and leave everyone else to deal with the boring, repetitive stress of it all (although we all know that we won't... it's nice to dream!).