Diehard is 100% a Christmas movie, however, Die Hard 2 which also takes place at Christmas time, is NOT a Christmas movie, as the fact that it’s Christmas is coincidental and not at all integral to the plot.
Christmas being part of the plot is irrelevant - The Wizard of Oz is a Christmas movie. I think what makes Diehard a Christmas movie is simply that people like to watch it at Christmas.
Diehard is 100% a Christmas movie, however, Die Hard 2 which also takes place at Christmas time, is NOT a Christmas movie, as the fact that it’s Christmas is coincidental and not at all integral to the plot.
Christmas being part of the plot is irrelevant - The Wizard of Oz is a Christmas movie. I think what makes Diehard a Christmas movie is simply that people like to watch it at Christmas.