It happened to me, and I came over here to mention how this statement can be misused and found this thread.
An OP asked if they were overreacting to something and I replied that my opinion was that they were being a bit "rigid" and therefore, yes, IMO, overreacting. I got a miffed response that started with TAIA.
In that context, the TAIA came across as pretty snarky/rude. First of all, an opinion that has been asked for is not an inappropriate assumption that needs shutting down. And that's what TAIA is for, right? Shutting down someone who has stated something (a) unsolicited (b) inappropriate and (c) rude. IMO, I hadn't done anything like that.