That's what I'm talking about. They are hitching their own secular meanings/celebrations to a religious holiday.
What if people decided to celebrate Ramadan by drinking every night at sundown? Or if millions of people created a tradition of having a pig roast on Rosh Hashana? Sure, you can do whatever floats your boat on any day you choose, but don't call it a celebration of that particular holiday.
I think what happens is that everything gets sort of sucked into the vortex of what we inescapably call "Christmas." Partly because of the predominance of Christians in Western industrialized countries, partly because it's such a huge opportunity to sell stuff, partly because early Christian evangelists tended to make their religion appealing to pagans by appropriating the pagans' own customs (fertility symbols at Easter, lists of saints that resemble pantheons, a rough approximation of the solstice conveniently designated the birthday of someone whose actual birthdate is unknown), partly because however you feel about Jesus it's a pretty nice opportunity to celebrate during a time of year that in Northern climates would otherwise be dreary or even forbidding ... it has become this huge mismash of a holiday, involving all sorts of different attitudes and customs and motivations.
And yeah, we wind up with people who aren't all that religious making a big deal about a holiday that's supposed to designate the birth of Christ. We have Jews turning a minor holiday into a much bigger event involving gifts. We have songs about snow and cold sung ostensibly in honor of someone who lived in a warm climate. All sorts of cultural contradictions.
Is everyone who celebrates "Christmas" thinking about Jesus? No, of course not. But nor are they, for the most part, doing anything deliberately malicious or anti-Christian (unlike drinking for Ramadan or pig-roasting for Rosh Hashana would be). You could, of course, make a strong argument that all this selling stuff and making money in the name of a religious observance would not have met Jesus' approval. But since our economy now fervently depends on that big year-end influx of consumer dollars, I wouldn't expect someone who is concerned about businesses doing well to favor eliminating that aspect of the season.
As for the rest of it, a secular approach to Christmas is mostly about people simply wanting a little fun and good cheer, seizing an opportunity to get together and eat good food and dress up and contribute to charities and express affection for their loved ones and fellow human beings. Is that so wrong? Would Jesus -- the guy who turned water into wine so a wedding party could have more fun -- object?
So they call it "Christmas" even when it's not really about Christ, and doesn't involve Mass. Maybe you could campaign that they change the name. Good luck with that, and FWIW I don't think Bill O'Reilly would approve.