I might be off base here, but I suspect the poster you replied to was attempting to be humorous, rather than expressing a philosophical truth about how 4chan users are actually the most evil thing in human history. Provided I'm correct, your response strikes me as a little like walking up to a six year old playing with a Rubik's cube and telling him how it was produced by slave labour in China. You might well be correct, but the context switch is rather jarring.

(edit: typo)