I am not wrong. You still have Hanukkah, you still have people who celebrate the winter solstice, and whether you agree with it or not, there are still people who celebrate Christmas without any regard to Jesus. They simply celebrate the holiday because it is traditional, but give no regard to Jesus at all. They don't have anything else to call it, so it stays Christmas.
The reason we have a legal holiday is because of the fact that the majority of the citizens would have been taking that day off anyway (although notice how it took almost 100 years after we were a country for it to be even declared a legal holiday). Why not make it a holiday if very few are working that day anyway because of their own beliefs?
And the whole season, would include all the holidays, not just Christmas. Afterall, these displays are being put up for the "season" at least a month before the holiday it is for. And many people follow many different traditions that have nothing to do with Jesus. Heck, the Christmas tree has nothing to do with Jesus, it would in fact be from Pagan tradition and can't even be explained for use in Christmas except as tradition, yet it is called a Christmas tree.
Yes there is something to be insulted by, whether you can see it or not. They are celebrating it for another reason, not Jesus. To them, especially those who have had their holidays from times long before Christianity, it is Christians who have stolen the holiday, not them. It is wrong to try to dismiss their feelings of insult because you can't see them but then hold up the Christians feelings of insult at being told to think about other people's points of view or to reconsider their beliefs as insulting because it is being said at "Christmastime".