How so? What empirical data do you have to suggest that? What are you basing this off of, the fact that tons of people can't stand Christmas music?
No, more that many canned Christmas music playlists have jazz versions of holiday favorites and thus people who wouldn't ordinarily listen to jazz end up listening to, and enjoying, jazz
I don't think you understand what jazz really is. A "jazzed" up version or someone who sings something in a different style almost jazz like doesn't make it jazz or make people enjoy jazz.
Orchestrated jazz isn't jazz? The early 20th century would like to have a word with you.
I also think that Ella Fitzgerald would as well.
Among many, many (many) others ;)
That's like saying Coltrane's "My Favorite Things" isn't jazz because it's from The Sound of Music.