I think Vod just means to prove to him that he is not worthy of the negative feedback, but most people will farm trust in order to do that.
Exactly - interact with the community in a positive way and build up trust. Catch scammers. Offer loans. Give technical support. Talk Politics, Develop services, etc.
I never farmed - yet I have built up substantial trust. Same with hundreds if not thousands of other users on this forum. It just takes time.