It's not that serious, there's really no need to be insulting

I'd be willing to learn about this

Now now, a difference of opinion doesn't mean we need to go negative

Of course. They actually do it within the movie itself, at the very beginning. It starts on Halloween and they have a very clear conversation that Halloween is over and they are sad because of that. Without Halloween, Jack would still be sad because he doesn't have something to celebrate.

It's a Christmas movie because, just like in Die Hard, you cannot remove Christmas and have the same movie

Exactly! John McClain is always going to think of Hans Gruber on Christmas BECAUSE it was Christmas when he met Hans Gruber