From the officially unofficial revised revision of the abridged community rules Section 25e, Subsection Alpha Green, Paragraph 4, line 9:
When the party of the second part is challenged by the party of the first part to recite a jocularity of questionable levels of humor, the party of the second part must comply.
The only known rebuttals to that is under Section 33b, Subsection Epsilon Periwinkle, Paragraph 1, Line 3:
The parties in question are not required to respond or initiate communication if their user accounts are no longer able to comment on the forums due to muting, banning, outages, or other unforeseen circumstances.