I, and perhaps some other people, feel that we are being unfairly targeted by a particular user, who has cast (as of this writing,) something like 16 downvotes to 14 upvotes.
My understanding is that downvotes are for content that is down right bad, not just "mediocre." I understand that we do want to get rid of the worst content on this, and other SE sites, with the worst being perhaps the bottom 10 or or 20 percent. My further understanding is that downvotes should consist of a relatively small portion of votes, perhaps 10 to 20 percent, to this end.
I have deleted one (of eleven) of my posts with the lowest score, and can reasonably see my way to deleting one or two more. That would serve the purpose of the "getting rid of the bottom 10 or 20 percent."
A person that casts more downvotes that upvotes "likes less than he dislikes." This person appears to have advanced training in Earth Sciences, but has made very few contributions to the site. If he has more to offer than I do, he appears to be "holding out."
Unlike others, I do not have a degree or "advanced" training in earth sciences, only a curiosity about the subject from my school days. Such people are more likely to be "consumers" than "producers" on a site like this. Even so, we have a role in providing "mass."
Should people vote in such a way ask to chase out the "bottom half," rather than the bottom 10 to 20 percent of the content on the site?