Examples:
Your post: "What if God did this weird thing…
Their reply: “God doesn’t exist so this question is nonsense.”
Your post: “In the year 2075 everyone gets assigned jobs based on…”
Their reply: “Dude, with climate change there will be no us or jobs to do in 2075.”
It’s the Internet. People are trying to have fun and talk about wacky shit and escape from serious matters. Can’t you either refrain from commenting or just play along?
It honestly sounds like it’s something else. I have aphantasia, but I have no issue with complex concepts. You’re right though that if the important bit is actually seeing it, then I’m at a loss.
From op I think it’s people having issues with understanding a concept.