Maybe so.
But you are right, some Christian's do not believe in Christmas at all simply because it is not when Christ was born.
In fact with some of them, their point is that the 25th of December was actually a pagan feast in Rome (which is true if researched) so that is why they don't celebrate it at all.
I guess the OP's original post was just trying to state that, we don't care who celebrates what, just don't force others to celebrate it as well of they do not wish to do so.