X doesn't celebrate Christmas either, but that's more because he had no idea the holiday existed until he visited earth for the first time. He likes celebrations in general, particularly birthdays, and he feels right at home in festivals full of song and lights and presents. Goodwill is an emotion he takes every possible opportunity to immerse himself in, because it's depressingly difficult to find otherwise.

Which is why, when he receives the text and his instinctive reaction is to groan, he knows immediately that Devin is the one who sent it.

I know a large man in a red suit delivers presents through fireplaces. I'm not clear on specifics.

With his initial reaction worked through and ascribed to its proper source -- i.e., not him -- X follows up with what he should have realised right away.

I take it the Fool's enamoured with it? ;)