See, I don't even see this as
@Mr Smokalotapotamus being wrong or right. It's that we are currently working in a disinformation overload. The way that any of us keep track of something being probably true or probably false is pattern recognition. We have certain known concrete things that continue to be true over and over and over and when something deviates from that it stands out.
In this case you have a significant changing of information sources compared to a very short time ago. As above normally lots of people all stating the same thing over and over sounds like it's probably true. Historically with gatekeepers of information it was much more likely that things were vetted before you heard them. Yes there's the concern of biases being added or not all information and making it to the top, but in general things were factually true. It was very rare that something that didn't exist would be promoted as existing. Being 100% opposite reality is not a common thing for many information sources to agree on all at once. But in the world of social media and blogs and whatnot, one influencer could come across sounding like thousands of different sources due to the echo chamber.
I don't think people are being wrong here as much as they are operating with old data validation techniques in a different universe.