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?
You are describing the “Concrete Operational” stage of intellectual development. At this stage people can think logically but only about concrete objects. Hypotheticals come later at the Formal Operational stage.
In normal healthy development, people grow beyond concrete operational around age 12. Many people do not, however.
https://www.verywellmind.com/concrete-operational-stage-of-cognitive-development-2795458
https://www.simplypsychology.org/concrete-operational.html