Walmart for one (the largest employer in the United States). When was the last time you heard an employee tell you Merry Christmas?

https://www.snopes.com/fact-check/an-unmerried-woman/

From that article, Walmart tries to play it off like they only "suggest" their employees say Happy Holidays.

But I've worked at Walmart, and if you've ever worked at a place like that, you know that people who don't follow "suggestions" are quickly fired.