I've never trained a bird to speak before, and I'm aware that there's over a dozen species that can learn human language. But just what goes into training a bird to talk? I had to look that one up and from what I've seen, you need to talk to this bird over and over again, numerous times a day, every single day, for months. Months. And this isn't idle chit chat. This is you literally saying "fuck you!" to a bird 50 times a day for 60, 90, 120 days in a row. That's the kind of shit that makes crazy people back out of a room.
So when some Average Joe posts a video of him and his bird just relaxing, and suddenly the bird snaps like a bread stick and cusses like the unholy spawn of a convoy of truckers and a boatload of stevedores, don't be suckered in by the "oh my goodness, what a little Dickens!" bullshit someone's selling you. This borderline sociopath cursed that bird out until its brain was Swiss cheesed with f-bombs and a hunger for seeds. There's nothing else going on up there.