I don't want to get in on it much, but "War on Christmas" is some of that right wing dog whistle stuff that...yeah...works to put it in the shortest form possible. Religious fanatics persecute their own kind for having slightly different beliefs, and have done so for eons. If anything proves that we have a very entitled culture all the way around, it's getting offended that a Podunk town in a state you don't live in doesn't have a Nativity scene somewhere.
I would say however, the clumsy attempts of retailers and using the umbrella "Holiday" title in the end is meaningless and pointless when you realize that they don't give two craps about representation of other holidays other religions celebrate that time of the year. I give some retailers all the credit in the world for their tiny, blink and you'll miss is Hanukkah corner, but even then, it's surrounded by an entire store of red and green with Christmas trees and Santy Claus and reindeer and other things the US appropriated from European countries. Christmas is a very dominating holiday, the commercialism proves that there's no way this is going anywhere.
But it's just that Thanksgiving has always been under scrutiny for being in the way of Christmas, even in the 40's (or earlier, maybe? I forget the exact anecdotal date) when the retailers were pressuring the President to move Thanksgiving up sooner, closer to that start of November, rather than later in the month. And frankly, whatever you want to believe about the European settlers, pro or con, this is an important holiday in its own right. If anything, it's a day to be thankful everyone's still alive and you hope they are for the next year, all the while being thankful that you're not dying out on the street in some war torn country. And maybe to feel so blessed, you share that with the less fortunate, even though that's usually the only time anyone bothers to do so.