Facebook is evil. Reason #418: people you don't know well or haven't spoken to in many years comment crassly on your inherently-meaningless internet activity.
I responded quickly, and in anger, and it was wrong. Here's what I should have said:
I'm sorry. Let me help you understand WTF I'm saying: it's funny because "Scott Pilgrim Vs. The World" is a film that just came out, so what I did was reference Billy Pilgrim, another fictional person with the same last name, from the widely-known novel "Slaughterhouse Five" by Kurt Vonnegut.
No? Okay, I guess I'll just go back to being an unimportant part of your life, therefore incapable of ruining any aspect of it.