You should approach this potlatch style: you offer a graphic description of something nasty that happened to you, to the public, unsolicited - be sure to roll around in it, really feel all the horrible feelings it evoked. Make sure to link the other party.
**Then** you can ask someone else to do the same, realizing that they aren't obligated to return your 'gift' in kind.
it's so fucking sad it's actually comical.