You down vote if you disagree or dislike a comment
I've always known that a lot of people used it this way, but I thought most people were on the same page that that's a misuse of the feature. I'm sad to see that I was wrong.
The purpose of downvoting (or voting in general) on any platform that offers it is for you to indicate that a post doesn't contribute to the discussion. It's a soft knob for you to say others won't find it worth reading. If you believe that use inherently aligns with indicating what you already believe then that's what makes people see Lemmy (and Reddit) as elitist and hive-mindy, because that's elitist and hive-mindy.