I personally have no problem saying the words, christ, christmas or jesus (I dont believe the concept of “yemach shmo” can be applied to a mythical figure who surely did not exist as is portrayed by the gospels – but I digress, this is not the place to discuss the roots and origins of christianity). I just wont use the words jesus and christ together.
It is not a question of PC though. It is deeply rooted in the mindset of yidden that atrocities committed in the name of jesus against jews have taken place for 2000 years and as a result there is an automatic reflex that shuns anything by or about him. It is a natural reflex to avoid it.