People who live in glass houses shouldn't throw stones. The joke here is that Jack, Mark (and others) already live in an unreal metaverse. These people are so

People who live in glass houses shouldn't throw stones. The joke here is that Jack, Mark (and others) already live in an unreal metaverse. These people are so far out of touch with reality that they're thinking about creating an even deeper virtual world than the fakeness they live in, just to escape it.