How about a new rank "Shitposter" that is skipped when ranking up, i.e. can't be reached by "normally" ranking up? But you can be de-ranked into it! This rank, once reached by enough shitposting with PowerGlove's proposal, would put severe limitations for those who become de-ranked into it. The details of such limitations are tbd.

Users with rank "Shitposter" will likely simply abandon their account? Not sure about that.