If I assert that you're a rank simpleton, does the onus fall upon you to disprove my assertion?
My! What a wonderful debate tactic! Let me try!!!
Hey everyone! I'm right about everything. Every opinion I've every espoused is absolutely 100% correct, and if you disagree with me even in the slightest, the onus falls upon you to disprove my assertions.
Haha!!! I'm God now! You hear!? Disprove me! I dare you!