I used to be a regular on Yahoo Answers and would post well-thought out replies to any transgender questions I came across.
However, once I noticed that the majority of the people I'd tried to help either continued posting the same question over and over with just a few variations in details and/or would pick some bigoted, transphobic answer as best with a reply along the lines of "lol i kno rite? f--ing ->-bleeped-<-s". There are few trolls that can actually make me feel sad. 🙁