The Earth is a flat disc.
Is this misinformation, wrongthink, or both?
To be sure it's a vague term applied quite continuously online but simply deflecting it as actually meaning "wrongthink" is disingenuous. There's a lot of misinformation being spread specifically about objective measurable facts. It is simultaneously true that a lot of opinions are being mislabeled as misinformation.
The liar can produce 10 lies and demands you disprove them or they are somehow true. The burden of the liar proving their reasoning is missing.
The goal is that their opinion and your fact be treated with equal weight or the opinion has greater weight simply because they can produce more "opinions" more often than you can facts.
This is also referred to as Gish Gallop and relies heavily on the bullshit asymmetry principle.
Interesting that there seems to be a lot of overlap between creationists and antivaxers. Creationists seem to buy into a sort of conspiratorial view of science where they claim that their "creation scientists" are purposely ignored by mainstream science which is in the grip of some kind of delusion so that they can't comprehend that creationism is the way or are in fact actively trying to subvert the idea that creationism is actually true. Extrapolate to vaccines and they easily believe that there's some kind of alternative science that hasn't been corrupted, but isn't widely known. Similar overlaps for denying climate change.
> Is this misinformation, wrongthink, or both?
Neither. It is an assertion based on a frame of reference. The mapping systems used on my phone don't often describe geographic topography and so assert a flatness to the surface of this planet. Likewise this planet viewed from its moon would have the visual appearance of a disk. Is "The Earth is a flat disc" a helpful explanation for operating in the world? Not if you are a rocket scientist but it isn't a terrible model if you live an entire life within the vicinity of your family farm.
“All models are wrong, but some are useful”. George E. P. Box
https://www.lacan.upc.edu/admoreWeb/2018/05/all-models-are-w...
> Is this misinformation, wrongthink, or both?
You missed the fourth option: it's neither. No-one would call it misinformation or wrongthink; rather it's false, or a lie if you're feeling judgemental. I think the person you replied to has made a good point.
Most people will not have the experience to discern things like p-hacking and massaged numbers. Having experts call these things out as misinformation seems quite useful to me.
Maybe. I've not heard people calling "misinformation" in cases like that though.