"Copy SCHMOPPY. Reality's a HALF-BAKED ILLUSION at best! As far as I'M CONCERNED you're just as REAL as the OTHER ONE."

[Who cares if they came into being by being fabricated by someone else's memories? There were stranger ways to manifest into existence.]

"For all you KNOW your EXISTENCE created the ECHO throughout the COSMOS which RETROACTIVELY led to their CREATION in the FIRST PLACE."

[Sheesh, mortals really had no grasp of life's inner workings!]

"So FRISK. Name's BILL! BILL CIPHER. But you already KNEW THAT, DIDN'T YOU?"