It's hard to believe, but this is how it works. There is a guy with the 12200 steam power and ~45 reputation, just goes and downvotes everything I post. Each such downvote results in a hidden post and a huge dent in my reputation. Since this creep clearly has a grudge against me, even walking on egg shells won't help. (I know that there's an option to disallow votes altogether, but I can't find it.)