I used to do this with Reddit but lately more than half of my feed is their recommended posts which include a lot of negative or ragebait content. Maybe a plugin can help with this
With Reddit, I unsubscribed from all the defaults and only subscribe to small, specific subs, which I browse via the Home page and via /new. If I see anything undesirable, I unsubscribe right away. It is a pretty good experience as of today.