I don't see a way to block individual users' posts from showing up in my feeds. There is no "Block" button on any user's page like there is for communities. For some reason I thought there was a way to do this before, but maybe I was just using another frontend? I see some users are blocked when checking my settings. I made sure to disable uBlock Origin to check if it could be an element hiding rule.
For the record these aren't rule breaking users or anything, but instead bots that automatically post things, some of them pulling links straight from reddit. I prefer my Lemmy being populated by humans.