If you find yourself wanting to argue over something like "is X a Christmas movie?", here's a simple suggestion: add "for me" to every assertion

For example: "yeah, Die Hard isn't a Christmas movie for me" or "for me, it's just not Christmas without a ham" — these aren't objective truths, and you'd be surprised how much less contentious things are when you make a little gesture indicating that you're not looking down on people who disagree