Suppose someone blocks me. The feeling is mutual, so I want to block them too.
Am I able to block them after they've blocked me?
This is what I call mutual blocking.
Is mutual blocking in the fediverse possible at all?
Is mutual blocking possible on Mastodon?
I don't see these two questions as equal. It could be possible to mutually block at the level of ActivityPub, but also for Mastodon to not have an interface that allows us doing it.
I know on some platform this is not possible. Once you block someone, you vanish out of existence, and they cannot also block you.
However, I'm thinking that it is possible to mutually block one another in the fediverse and Mastodon.
I've searched the web and I haven't found a discussion of this.
As far as I know, there's no direct way to do this in vanilla Mastodon as the menu which includes the block option becomes inaccessible when they block you.
It might be possible on ActivityPub, but not on vanilla Mastodon.