It definitely seems to be a phenomenon made popular on sites like reddit - a lot of the threads there are ‘TIL’, ‘AITA’, ‘TIFU’ etc
Now it’s my turn: I’ve never encountered AITA or TIFU. I can guess what TIFU means but I just looked up AITA and it would have taken me seeing it in context at least several times to suss it out.
The fact the outfit called IATA was big in my industry was a large distractor as I was running through various word combos in my head trying to guess.
Ditto, except for the distractor. I can guess TIFU, but I’m not going to get AITA on my own.
Updated: i googled it. I’ve heard the phrase a lot. I don’t do acronyms well.
Back in the early days, for years I thought LOL meant “lots of luck” delivered with a sarcastic tone. Oops. 
I often think of correcting someone but try to restrain myself. The other day the Votemaster used the word wethinks, which should obviously have been usthinks, but I refrained from sending them a correction.
I’m reminded of a story Isaac Asimov tells in his autobiography. It’s been decades since I read it, but as best as I remember it goes like this:
As Asimov describes himself, as a kid and young adult he was an annoying know-it-all, always correcting people. Especially in matters of science. He recognizes now (as he was writing) that he was irritating.
Then, one day when he was in the army, he heard two soldiers discussing a scientific point, and they were very wrong. So Asimov was just about to speak up when he had an epiphany: “What difference does it make to me if these guys are wrong about something? None at all.” So he kept his mouth shut, and stopped correcting people.
Sadly, he didn’t restrain himself from other less savory activities 
My “Isaac Asimov” collection went in the dumpster some years ago, never to be seen again.
Correcting someone usually results in an argument. Their feelings are still hurt when I use Google to prove a point.
It’s not worth it.
I don’t say anything.
Isnt that book burning for a sort? Just donate it.
Moderating: let’s not get into a debate about Asimov in this thread, please.
I guess it’s just in my nature to want to make sure our language is well-maintained. It’s why I’ve spent most of my professional life as a copy editor (and, heck, one of my few diversions from that path was as a reading tutor). But I also used to do a significant amount of correcting outside of my professional responsibilities, and I just don’t have the energy or motivation to do that anymore. In fact, nowadays I’m more inclined to be of the attitude that if you want the benefit of my grammar skills, then you can pay for the privilege.
I’m baffled here. It’s not that people are asserting that one usage or the other is “correct”, they’re telling you that you somehow have a duty to only use the dialect of your native country, no matter where you are or who you’re talking to? I’ve never encountered that particular idiocy before. Is it English or American people who are saying this?
Those are usually English people I think, who apparently feel a duty to defend the purity of the something
Ref @Thing.Fish a couple posts up …
Most folks here are white Americans. I am, I think you are. As such, most of us don’t experience the flood of “cultural imperialism” where our vocabulary, accent, etc. are invading literally everywhere and everyone who does it differently. Thanks first to movies, then TV, and now the internet for a triple-pronged attack on localisms.
Lotta folks resent that. Whether they’re silly or sensible to resent is a separate question I’m not prepared to engage. But resent they do and the Englishman @Mangetout takes that heat.
Well, as an American I think that’s a load of shite.
I generally do not correct, unless it is a person I know has a personality predisposed to accepting and enjoying corrections. There are like one or two people in my life like that. What really raises my hackles are those pissant pedants in Internet comments and even a couple on this board who nitpick every little slipup or typo. If it’s an obvious typo, leave it the hell alone! It’s understood what is meant and your correction isn’t suddenly giving clarity to confused readers or informing the poster of something they didn’t already know. It’s just a “look at me, I’m so smarter than you!” type of post. I will correct my daughter’s English every so often. They like to say “the brang something somewhere” instead of “brought.” I let them know, in more casual words, that while "brang’ is an acceptable dialectal variation where we are, their teachers will want to hear “brought,” so “brought” should be used, as that’s the prestige dialect past tense form of “to bring.”
On the one hand, that’s totally a real thing, and I get why people dislike it.
On the other hand, I just triple checked my list of “People who have earned the right to be shirty about being on the receiving end of cultural imperialism,” and Brits aren’t showing up anywhere.
One cannot just let people by with being wrong on the Internet.
“Daughters’ English,” of course. So I can correct myself.
When I hear or read something that’s wrong I feel an almost physical hurt, I used to try and correct everybody but with time and maturity I realized I was just pissing people off, so now I try to refrain from correcting anybody (with clenched teeth)