The movie is Christmas themed throughout. They play a Christmas song by Run DMC for the opening credits. It's at a Christmas party on Christmas Eve.
There are even subtle Christmas jokes, like when he leaves the dead body in the elevator with "HO HO HO NOW I HAVE A MACHINE GUN" written on his sweater.
For me, a movie or song just needs to have the theme of the holiday. Otherwise, by your sister's logic, Home Alone and Office Christmas party aren't Christmas movies either. Home alone is about a boy surviving being home alone while his family try to get back to him after leaving him on a Christmas trip. And Office Christmas Party is about people trying to save an annual Office party that happens to be for Christmas. But they aren't
about Christmas.
Die Hard also ends with a Christmas song.
Another interesting note, my lady friend also doesn't like yo consider in a Christmas movie, and I think one of the real reasons why is due to the action and violence.
One love
Edit: with respect to the argument relative to when a movie was released, A Very Harold and Kumar Christmas came out in the states on Nov 4 2011, which is closet to Halloween and before Thanksgiving.
What if the "truth" is: the "truth" is indescernible/unknowable/nonexistent? Then the closest we get is through being true to and with ourselves.
Know thyself, nothing in excess, certainty brings insanity- Delphic Maxims
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Question everything... including questioning everything... There's so much I could be wrong about and have no idea...
All posts and supposed experiences are from an imaginary interdimensional being. This being has the proclivity and compulsion for delving in depths it shouldn't. Posts should be taken with a grain of salt. 👽