Controls that would do what you're asking for are called algorithms.  They could be built into a single client, but I wouldn't want them to be built into the protocol layer.  Seeing something I don't like in a conversation thread is unavoidable, because no matter how much we would wish that all humans are reasonable and caring individuals that we would enjoy interacting with, it's never going to be true.  The only way to build a feed that makes us happy is to be able to see the wall that protects that feed, and that means we have to see the ugly to recognize it and have simple solutions in place to deal with it.

The way I understand things, and please correct me if I'm wrong, there are two ways to build a wall.

Mute, which prevents anything from a profile from showing up in our feed.

Block, which mutes and also prevents anything from our profile from showing up on their feed.

We should be able to control the wall.  If anyone or anything else controls what we see, we're no different than any of the corporate platforms, allowing others to control our feed.  That's my concern.