Where do these myths come from?

[CosmicOwl]

I feel like most people who are in the hobby have at one point probably believed a reptile/snake. I don't mean ridiculous myths, such as snakes only growing as larges as their enclosure. I'm talking about the myths that get passed around forums and betweeb experienced keepers as if they were the truth. For instance, a lot of people still believe that feeding snakes in a separate enclosure will make them tame. There is also the belief that reptiles shouldn't be kept on sand because it causes impaction and can get under scales.

Where do you guys think these idea originate from? Sometimes I think a lot of them could probably be traced back to a misquoted scientific study or the opinion of a breeder. Is it possible that anybody might know original source for some of the most common and pervasive myths that have taken root in the community?