This whole thread really highlights something that is arguably as dangerous to society as climate change - and that is anti-intellectualism and misinformation.
Once upon a time, we looked to scientists and said: hey these dudes are smart we should listen to them. Now, with climate change deniers, anti-vaxxers, flat earthers and what have you, something someone has read on facebook that satisfies one's prejudices, can be given the same airtime as actual researched, supported by facts reasoning.
Where has it com from? Why does it persist? I don't really know for sure, but I consider part of it to be driven by those who feel it gets to make them feel a bit smarter/superior themselves. The kid who wasn't particularly bright at school now gets to stick to those university-educated wankers or whatever... it appears to be prevalent in all generations too, it just manifests in different ways.