There is a terrifying amount of it, and it's not just in the states either. Plenty of completely baseless propaganda going around here in Norway that just gets propagated and kicked off even more.
I've seen otherwise agreeable, reasonable people spread stuff like "Children should be allowed to sing Glade Jul (Norwegian version of Silent Night)! SHARE IF YOU AGREE!"
It's... Nobody, absolutely nobody is stopping anyone from singing Christmas songs. Not even in October, when they really should. It's a complete non-issue. A vicious, tooth-and-nails fight against a boogeyman that simply doesn't exist.
Just like the old anti-muslim sentiments from years back about how middle-eastern immigrants had manipulated the government and were in the process of renaming the capital from "Oslo" to "New Mecca", and that they were going to change the flag from a cross (technically a sword, but whatever) to a crescent moon.
Completely unfounded, amazingly flammable. I even happened across a Muslim message board where a bunch of users were discussing the case, and nobody understood where the fuck the idea had come from. Most posters also said that they either didn't care at all about the flag, or that they just looked beyond the cruciform image and appreciated it for the nation it represented. A lot of patriotism, which, y'know, is actually fairly common with 1st and 2nd generation immigrants...
It's just exhaust from the hate machine.