> don’t believe anything you read on the internet

That's many years beyond usefulness now that governments and companies communicate official information through the internet. You might as well say "don't believe anything ever" which makes the advice useless.

It's fine that people believe false things like flat earth. Why so much pressure to stop that? False beliefs are the default for most people, and they actually serve a purpose. We're mostly not emotionless truth-seeking Spocks. We can have religion and other beliefs that improve our quality of life by providing a sense of belonging or importance, an identity, or a community. You wouldn't go around telling Jews that no, God didn't give the 10 commandments to Moses, stop believing unscientific rubbish just because you read about it in some scroll.