You can block the whole Fediverse community. I did. Like, it's helpful. I also blocked asklemmy. Also helpful. I haven't blocked it on kbin, though. It doesn't matter, I see shit I'm not subscribed to when I filter by "subscribed" still. I think filtering by keyword is going to be a long time away. You can be obnoxious as a commenter, though. When you see the keyword, say something contrary in a comment. That could be fun.