it's a proper mental mindset that nothing can be believed if you yourself never invented the thing
I was thinking about that at the weekend when looking at repairing something for my son. It involved stripping down an electric motor, cleaning it up etc. Can I describe in detail exactly how it works? Yes. Can I prove there is a magnetic field and it only affects certain things? Yes. Can I describe how an electromagnet works and how the opposing magnetic fields cause the motion? Yes. Have I ever made an electromagnet myself? Yes. But did I invent the electric motor and discover electromagnetism myself or was I just schooled into this stuff. Well no I didn't invent it and I did learn it at school. Well sorry, that is invalid, that is an appeal to authority and therefore I can't stand here and say that electric motors are real and I clearly don't have a clue how they work.
This clearly means there is absolutely zero evidence for how an electric motor works and puts that idea on a lower footing to the idea that it is a votabulator being brought into existence from a higher dimension because of the presence of electricity arcing and they like to turn coils of metal. It is logical if you free your mind from what you have been schooled and think it through.
He keeps saying we skew a flat map to make a globe but can't produce a flat map that works

He is floundering desperately on this one. It is such a simple thing to provide. We have gone into all sorts of stuff that is hard to present on the web. Light, sound, space, magnetism, gravity, magic crystals, but a map is simple and we should have really just stuck with the basics 800 pages ago.
A map either works or it doesn't and it can be verified. We can't send something into space easily. We can't point to people who have traveled into space and not been in the employment of a government sponsored industry or very large company run by the insanely rich. But we can point to distances traveled by average people in their many many thousands day after day. It is the most basic form of independent verification. If we put all that data together we get a globe. We can't produce a 2d map, it just fails.
All he is stuck with is saying "tweak a map". He gives hints at what others should do. "Think of the UN logo", but has completely failed to provide something himself. Bear in mind that if anyone mentions a squirrel, he will be all over it asking if they have ever seen one and if they can produce a photo they have taken themselves. Look at the whole Jupiter discussion a few weeks ago. Jumping on everyone, "ah but have you got a photo of Jupiter you took yourself?". Asking the same people the same question over and over again, dismissing any talk of Jupiter if they had not produced their own image. It is convenient deflection, if you don't have your own then your argument is invalid. Until I produced one I took myself and followed it up again with another one I took in the last couple of weeks (I think or did I forget to share that?). No reply to my posts.
Give me your evidence he demands, but is happy to tell us we are all misguided fools, he knows the truth but can't put forward a simple map of his fantasy world or he claims there are loads of simple experiments that disprove the globe, yet refuses to describe a single one other that a spirit level in a bath, which has been proven to be pointless.
We will all ask again, but today and tomorrow will be another couple of days without him producing a map.