I know someone offline who also claims to believe that. It's no different than asking for proof that God exists or does not exist. It's basically the same exact question, just asked in a different way.
I can tell you this: reaching a point technologically where we might one day be able to create an artificial reality so good that we can't tell the difference.. automatically makes us question if our own reality was artificial. This is either a sign of awakening to Truth, or a sign of being compromised as a species by Evil. I don't claim to know the answer, but gut instinct tells me it's the latter.