The past couple of years has convinced me this is 100% untrue.
People are very capable of ignoring evidence, in favour of something that:
a) reinforces previously held beliefs
b) allows them to remain in a social group
Most people believe what they are told at face value.
I stop just short of Feynman questioning the dentist on the evidence for brushing one's teeth. That there is potentially this ritual that goes around the globe as the sun rises of people pointlessly scrubbing their teeth.
Of course, with such a high % of people addicted in a clinical sense to the group think and propaganda engine of social media that is not how most people are going to think or even be capable of thinking.
If Feynman was more popular youtube would ban that video for dentistry misinformation even when the point of the video is to view things from a different perspective.