ChatGPT solely responsible for that feeling of "the world feels weird now" that everyone is feeling and has caused /x/ posting to increase recently. Maybe the plane lady thought someone wasn't real because ChatGPT made her question her previous beliefs as not being real and then she started to question other things and it created a snowball. Imagine every dumb blonde b***h actually getting existential philosophy for the first time in history ever, thanks to the subtle ways that existential dread and doubt can be spread using ChatGPT-optimized human-to-human communication.
That is to say, airplane lady may have never used ChatGPT, and not even know what it is. However, so many humans that she has interacted with directly or indirectly have used it, and so this questioning of reality, especially human-originating religions, has already ingrained itself into the zeitgeist.