My suggestions, if anyone will receive a -ve trust feedback for a participation please re-send a -ve feedback to the person. That's all.
Are you seriously suggesting retaliating feedback, with the reason "sent me a negative"?
Retaliation feedbacks are one of the worst things you can do, they completely destroy a persons credibility...
(
http://archive.is/ywZWf#selection-1983.0-1983.137)