My bad, I meant community. You can block communities individually. For blocking instances as a user there’s an open issue on Lemmy’s GitHub, but I believe it’s not going to be implemented anytime soon.

Give me the few years I need to grasp how Rust actually works lmao

It’s possible, it’s one of the downsides of being federated. The instances are moderated independendently, there is no central authority that enforces law or morals. It’s great to avoid things like what happened to Reddit, but stuff like that can and will show up. You can always block instances to avoid seeing them, if you want.