He doesn't really demand proof. He demands something that has never been uttered by human tongue previously. He wants someone to invent something totally new for him. Anything that has been uttered in human history can't be considered as it's from a second source and therefore authority driven. If people actually do some experiments/workings out themselves, as they have on this thread, it's simply ignored or asked for again without consideration.
Imagine being a person who is not scientifically minded at all telling people who are and who work in industry he knows better than them about their field of expertise. It's insulting and embarrassing.
It is a conspiracy theorist trait and something seen on many forums and many types. Deep down many just want attention, some go to more lengths than others.
Look at the other CT, parm on here. Always just a one or two liner, alluding to something such as "they really went to the moon in that?". It is 8 words that take a few seconds to type but is really saying "Go on, I've only hinted that I don't believe it and I'm not putting up anything to say why, only suggesting that it doesn't meet my personal expectation of a space craft so please can multiple people write quite lengthy bits of text for me to then dismiss with another one liner".
A couple of days ago I listed a few suggestions for a Conspiracy Theorist playbook and in it was "do some homework". Otherwise known as feeding the troll. People seem to get a kick out of making others do a huge amount of work, only to then resort to the other classic "nah bollocks". This dismisses all this work and evidence out of hand usually for no reason with no analysis or discussion of the finer points. It doesn't hold the result they wanted, not interested, must be a lie. Though occasionally it may be followed with a "do some more homework" or "I'm going to ask the same question again to see if you will do the same work again but reword it all".
Being aware of that, I'm careful about what this thread prompts me to do and what it doesn't. I've provided large bulks of information but always at the back of it is 'does it trigger something in the back of my mind that gets me thinking and wants to work it out'. The silly square rule is an example. For personal interest I wanted to work out what the correct rule should be so started with blank paper and drew a circle, then went from there. Comparing the results to the broken rule, they were surprisingly close for the first 50km. This peaked my interest so I was happy to graph it out and then it only took 10 minutes to do a write up, so I didn't mind and thought others would find it interesting. Other things have been asked for or I talked the other day about using calculus to work out how much atmosphere you look through from a cliff top compared to being on the ground. But that is a lot of work and fundamentally it is modelling a fantasy land and the retort will be "nah bollocks, maths doesn't prove or tell us anything", so I just can't be arsed. At heart I like a puzzle to be worked out.
What I do find curious is the lack of critical thinking applied to most. Invent something new yourself, don't appeal to "authority" (nobody has said what authority actually is, but hey). What is never asked, even about something basic is "can I prove this is true of false" or "what evidence do we have to support, what was the motivation of the writer?". For the second part a great example would be why do almost all world governments and many private companies pretend to partake in space programs, and how to they get the hundreds of satellites up there we can all see? Why has astronomers been saying it is a globe since the 3rd centaury BC? Why do so many other branches of science and travel then conform to this idea? How can you make a conspiracy so large spanning centuries without anyone saying "hey, I've just had my induction and .....". Not even spilled on their death bed.
When I studied history at school, this was a key part. We can never prove conclusively historical events so you have accounts. Who wrote it and when. If it was written by the church for the church 400 years after the event, went against evidence written at the time and supported an already supported belief, then you have reason to be skeptical. If both sides of a battle recorded the same thing at the same time, likely it is fairly accurate.
For the first bit about the most basics being dismissed. We have gone to the lowest levels and when it comes to some of the maths or basic physics it can be proven from first principals and that is covered in most school courses.
But if you dismiss everything learned by the entire history of humanity then any fantasy alternative is therefor on an equal footing and it is "up to the individual to decide". Usually their world has been created without experiment and proof too. In the end I think it becomes both a way of justifying their beliefs by ignoring anything to the contrary and deflecting from their lack of truth by setting a challenger homework to do, to feed their need for attention.
So if a carriage pushes a train, why is the engine needed?