How many of them do things that, when put together, would amount to celebrating. Most of us find it natural to celebrate Christmas, and it's the pagan part that appeals the most. Some of them do buy presents, albeit not all of them and albeit that some of the gifts are useless such as ties, suits, and field circus supplies. Just think of the foods that go along with Christmas. How many witlesses eat turkey? Some enjoy eggnog, as well as pumpkin pie. Even if they are marketed as "sun worship" items--available only around Christmas and as a Christmas item. You see some driving around to look at the lights, even if they almost never put up any themselves. I even saw one witless, a hounder at that, with a chandelier (not a big one, though) with glass prisms dangling around the perimeter to a height of 1.8 meters above the floor (I myself hit one of them and busted a chip off one prism, and another had someone else do the same). I have seen worldly homes this past Christmas with less decoration on them.
I believe it is impossible to totally do away with all elements of Christmas without being a needless burden and being bad for one's health. No presents at all? That would mean no toys. Even allowing giving of necessary items to children that are dependents (such as clothing, food, field circus supplies, and so on), it would be miserable. And just start listing all the foods that are a part of some Christmas celebration--and don't forget those in New Zealand who use strawberries and kiwi fruit to celebrate Christmas. Before long, you are left with a rather boring diet--on the same level as those crash diets to lose weight. Beef, ham, turkey, eggs, chocolate, cherries, pineapple, green beans, Cream of Mushroom soup, cranberries, pie of all varieties especially lemon meringue and pumpkin, peppermint (and the Christmas variety is especially sweet), squash, yams, potatoes with gravy, and what not--and there are many other items to list. Do away with that, and what are you going to eat? And those colored lights--just try going into a store around Christmas, and you are going to be drawn to the Christmas display or be made sick trying to suppress it.
As for the Christmas songs, how many of the witlesses allow the non-Christmas ones? You know, songs that just go along with winter. Sleigh rides, jingle bells, and so on are more winter than Christmas. Yet, many witlesses think there is nothing wrong with listening to such songs. While they might not sing them (or, if they do, it is a total mistake), they still listen to them in public places. Which might have been a "there's nothing we can do about it" until the advent of the personal stereo that allows nearly endless music to go on. Auto-reverse cassette, then mini disc and portable CD, then MP3--except for at work where such are not permitted, today there is no excuse if anyone really wanted to avoid the Christmas songs.
Not that there is anything wrong with doing it. Just that so many witlesses are so pious that they don't do the whole thing, yet they participate in segments of it. As for me, I just go ahead and display Christmas lights, participate in Christmas events, play Christmas music on purpose (not just listen to it), and so on, and actually call it celebrating Christmas. And I do parts of it all summer--I have enough Christmas music on my MP3 player and on mini discs to enjoy all summer, and I get more light from my Christmas lights strung up throughout the apartment than I need (meaning the LED light bulbs I have see relatively little use, so I will probably die with 70 of them still queued up waiting to be used).