Ok, I'll probably regret this, but show me this absolute truth your family scoffed at.
We could still be living in a simulation. The Hindus believed that all that we see/hear/sense is Maya, illusion and this is an old concept. But an illusion or simulation can be 3D hologram. Why must the earth be flat?
The better question is why are we discussing this? Maybe a diversion for some people so they don't question more pressing problems that affect all of humanity?