NTA OP. Your friend seems to be victimizing herself for pity points and all I can say is, move on and make better friends. People who make these general statements don't really care about who it effects, they just want to make waves and draw attention and sympathy. I have no doubt that until now, she seemed like a good person and that led you to believe she was, but people usually speak their minds on social media more than they do in real life. If she is willing to throw you under the bus like this over a generalizing and toxic post on social media, it says a lot about how she will treat you in the future over less. Good luck OP, I hope you get a nicer friend.