Well that person has reputation/credibility and some reasoning they apply, before passing on the information. Just because you read that the world is flat are you gonna start telling people that? Now let's be clear, some people do mindlessly regurgitate nonsense, but their creditability is typically very low, so you ignore them. There is a grey area where some things aren't clear, but on the basics people of average intelligence are fairly robust, I'm not convinced chatGPT is.

You can ask where they heard it from.