I think people who cycle regularly are the "type" of people who are generally more intelligent and/or are older (i.e. older than 20) and are therefore less tolerant of the commercialised, Americanised, consumerist shift that Christmas has taken in the last 25 years.
What I'm trying to say is that kids and the chav masses lap it up, whereas the rest of us are more cynical! I'm not saying I don't love Christmas - I do. But if I had my way there would be less emphasis on the gifts, and more on spending quality time with family if you're lucky enough to have them close by.