Just do what I do: open the video, downvote it, then go back to the recommendations, hit the three dot menu, and click "do not show me this channel anymore", an

Just do what I do: open the video, downvote it, then go back to the recommendations, hit the three dot menu, and click "do not show me this channel anymore", and if your sections have a three dot menu, "do not show me this section" for all the rightwing whackjob nutter categories. Youtube eventually learned to stop showing it to me, and due to my downvotes, may be now restricting showing them to anyone.