I think a single extra “duh” button, that does not reduce karma but does affect the percentage of positive votes, would do.
Also maybe turn the thumbs up into a “thanks!” button and the thumbs down into a “waste of time” one, or something.
Precedent: the science subreddit got way better after they renamed the upvote button into “solid science” and the downvote button into “not science”.
I think a single extra “duh” button, that does not reduce karma but does affect the percentage of positive votes, would do.
Also maybe turn the thumbs up into a “thanks!” button and the thumbs down into a “waste of time” one, or something.
Precedent: the science subreddit got way better after they renamed the upvote button into “solid science” and the downvote button into “not science”.