Ouch

Frankly this movie barely feels like a Christmas movie but frankly, these to me are the must see movies I feel I want to watch during the Christmas season.
A Christmas Carol (just about any version)
A Christmas Story
The Santa Clause
The Jim Carrey Grinch and the original cartoon of Grinch with Boris Karloff (though I'd argue that isn't really a movie)
It's a wonderful life
Miracle on 34th street
Home Alone 1 and 2
Scrooged
I don't generally watch Die Hard around Christmas but even I'll admit it is more Christmassy than Lethal Weapon which unlike Die Hard, Christmas is barely even mentioned. Heck, unlike Die Hard I don't think anyone even says, "Merry Christmas!" in it. When last watching Lethal Weapon a few months ago for the first time in years, I had forgotten about half way through that it was even set at Christmas and didn't even remember it was until the finale when the 2 main characters crash into a house and then into a Christmas tree. Oh. Also, unlike Die Hard the premise has little to do with Christmas at all. I'd argue Christmas is an after thought in Lethal Weapon.

So, not at all a Christmas movie since Home Alone isn't about the holiday, either.