I don't really understand why people get so worked up over Christmas music. It's kind of childish, I think, to complain so much about it. Shops and radio stations have the right to play whatever music they like...except in the case of the poor person who lived across the Christmas market and had to hear it 24/7 out his/her own window, it's not like you're forced to listen to it in your own home. I don't bitch and moan when I walk into a shop that's playing smooth "jazz" or some other such rubbish.
Personally, I love Christmas music. I'm listening to it right now, as a matter of fact. And I'm not even Christian! I also recall caroling as a child, with my girl scout troupe and sometimes with my family (though they aren't Christian either, we all just enjoy the holiday).