You have just asked me if I don't celebrate Christmas in reply to a post in which I wrote that I don't celebrate Christmas. Doesn't that seem strange to you?
If you meant to ask if I meant that I don't celebrate Christmas, then yes, that is what I meant. I don't celebrate Christmas.
If you meant to ask why, the answer is simple. It's a religious festival for two religions in ancient Rome, none of which I follow, that was usurped by a made-up festival for Christianity, another religion I don't follow, and peppered with bits Christianity absorbed from other religions I don't follow. So Christmas has nothing to do with me - why would I celebrate it?
If you're mistaking Christmas for the secular midwinter festival, well, that's a common mistake that I don't make. Christ's Mass is not a secular thing. I don't celebrate the secular midwinter festival either, but that's just because I don't care about a commercialism festival that's usurped a Christian festival that's usurped a Mithraic festival and an older Roman festival.

