I've seen this in the "social network" of code reviews where I work. A "downvote", i.e. a negative comment, often has the opposite effect of the one intended by

I've seen this in the "social network" of code reviews where I work. A "downvote", i.e. a negative comment, often has the opposite effect of the one intended by the reviewer. The code author will dig in their heels and over time contribute lower quality code. Alas, I don't have the luxury of simply ignoring lurking bugs.