Everything you thought about your reality, the simulation, consciousness, the most basic questions of who the hell we are is all up in the air now. I don't know if civilizations probably never been in this position, have we? As any civilization ever been in a position where their dominant belief about the nature of reality got crushed, and then they had to rethink it all from scratch, I doubt it's ever happened. It would be like aliens landing and saying, oh, you were right. We created you. We just came to check our work"