Every day, I see absolutely moronic comments getting upvoted while perfectly reasonable takes are downvoted. This would be a great opportunity to curate your feed by blocking these users en masse. Active curation like this is the only way to make social media even half-tolerable.
Whether you use it to filter out toxic users or to build an echo chamber, I think everyone should be free to do so. No one should be forced to share space with people they feel bring no value to the discussion - or, worse, make it more toxic.
Upvoted as unpopular, per the rules of the community.
I don’t think this would be an even remotely good feature.
You never know why someone specific up/downvoted a piece of content¹; at most you can pull up some possible explanations, but if you treat any as certain you’re just assuming². As such you’ll be blocking a lot of people based on things that you don’t even disagree with.