Well, it's also a very deep rabbit hole that mustn't always be talked about openly. Because fighting abuse and bad behavior is not a nice part of the scene and we've seen all the possible ways of getting out of hand.
The easiest way to react would be to counter downvote self-votes and let the author know that you're not a fan of his bad manners.
In this case, I still don't know who it is, that might have already happened - or it should be done, m a y b e.