I just figured it was part of the war on Christmas. Let's just X out, as in delete Christ from the Holiday. It's not a notation I use and haven't in many years now.
The X is from the Greek letter Chi which is the first letter of the Greek word for ‘Christ.’
If it’s “an attempt to take Christ out of Christmas”, it’s been going on since the 16th century in that its first usage “Xmas” was about the time of Henry VIII.
You noobs are as thick as ticks tonight. Lighten up. Xmas is over.