In TN, people use it all the time, especially in the Appalachian mountains. Prior to 2015, people weren't involved in some weird Tumblr civil war involving pronouns. If you're asking if I use it out of some weird ploy for 'gender neutrality'. No. I'm sorry to disappoint you. That's not the reason. You've put way too much thought into my use of 'they/their'. I deleted this to add something so you realize I'm not being bitchy toward you:
It's just really weird because in the past year or two, I've gotten a lot of people like you who ask about it negatively. Alternatively, I have people stop me to go, "Oh, are they 'agender'?" I'm always like, "What the fuck are you are talking about?" "Oh, well, you used 'they'." It's really weird. No, I'm not referring to someone of some atypical gender identity. I'm just a hick, that's all. I apologize for causing confusion.