I'm never normally pedantic but I wish that people who say the world is definitely NOT flat would stop calling it "round" .. a circle is round but it can still be flat .. this niggles me .. use the words "globe" or "sphere" instead people when disagreeing with flat earthers .. *goes for a bit of a lie down*
Reminds me of one of my favourite quotations by Isaac Asimov, which I'm now probably going to misremember and butcher somewhat, but it was along the lines of;
"It is wrong to say that the Earth is flat, and it is wrong to say that the Earth is round, but to think that both of those statements are
equally wrong is wronger still".
And I suppose that's where a lot of this nonsense comes from in the first place - people with little scientific knowledge, and no scientific education, see the "Science vs. Religion/Faith" dichotomy and assume that Science is a belief system in the same sense as religion, that it has its doctrines and absolute truths (you see this in creationists thinking that attacking flaws in Darwin's work somehow undermines the whole concept of evolution), so when a scientist comes along and says, "actually, we were wrong about X", or "the Earth isn't the shape we thought it was", what they see is, "well, these scientists keep getting things
wrong, what do they know?". When the entire purpose of science is to keep proving itself wrong as new information becomes available.
But it leads to this "well, science doesn't know
everything..." mentality that then jumps to the conclusion that science doesn't know
anything, wrapped up in the usual conspiracy nonsense that scientists are all in some grand scam to prevent The Truth from getting out, or else are stubborn dogmatists afraid of conflicting theories. What I found curious about it is that, despite that, the people who propose Flat Earth theories do so in attempting to wrap them in an approximation of the methodology and language of the science they refute. I almost have more respect for those who argue the Earth's flatness on purely religious grounds.
I'm convinced, though, that an awful lot of people making claims of a Flat Earth are doing so with tongue firmly in cheek. Either as a thought exercise to show how even the most preposterous claims can be made to sound convincing when presented in the right manner, or as a troll job. The danger, as with so many things online, is that it's very difficult to separate those who are just playing along for a laugh from the true believers.