This may not necessarily be about rejecting political correctness. In the United States (article mentions the recipients of the email were from the US), Christm

This may not necessarily be about rejecting political correctness. In the United States (article mentions the recipients of the email were from the US), Christmas is celebrated by many for other than religious reasons and is its own cultural celebration, much in the same way how many people will watch the Superbowl despite having only a passing interest in football.