Wrong. I hear it everywhere--including my daughter's public elementary school. I see it on TV. There is a beautiful show on Animal Planet called "Animals of the Nativity" all about the story of Jesus' birth. The songs sung at my daughter's school, btw, include "Away in a Manger", "Silent Night", "Pat-a-Pan", "The First Noel". They do sing Jingle Bells, too. I suppose some would think that cancels out the others...
Our Grand daughter sings in several groups and is the leader of the High School chorus "The Limited" and they must observe the pc bs at school.