[LOOKAYANNER]

Actually, Xmas was used as a term for Christmas before the word "Christmas" was used. X is Chi in Greek, which is used for the word that means "Christ. "
The word "mas" is Old English for mass. The use of Xmas predates the use of the term Christmas by nearly a thousand years. The X is not demeaning Christmas, it's just the way it was written by the ancients.
Of course, times change and it's not used very much in today's world. I never write it that way because I understand that it bothers some people, especially if they don't know the history behind it.