Maybe you should give it a try in some special forum sections where not that many trolls are running around...not making it public anyhow, the people who are posting there will recognize it and use it.
Its very good to have some silent feedback on your posts and you are probably right with butthurt people downvotung alot of posts, but there should be at least as many guys who could use this feature pretty good because they think they are not clever enough to post some good argument and just give the poster a sign that he supports him.