Flat Earthers many times raised the point with physicists [who were not flat Earthers] that they were using huge measures of time and space. The flat Earthers said they would only believe it if they are able to see it or experience it. They put a lot of stock and a lot of value in what they could see and what they could observe by themselves. They want physical proof.
That said, they were enthusiastic about research. They often seemed more informed than the physics PhD students [who didn’t believe in the conspiracy] they debated on one of the panel discussions at the conference.
Sounds familiar?They are very skeptical. If you believe the Earth is flat, then there has to be some sort of conspiracy to keep that information out of public domain. The conspiracy then goes from the government to scientists, who use false data. For them, there is very little outside evidence that is not explicitly linked to people part of the conspiracy.
https://qz.com/1268605/what-its-like-to-attend-a-flat-earth-convention/