Yup, any client will allow you to block accounts or instances but noooo the other instance’s admins must do it because someone somewhere somehow got micro-offended at something!

To me, that’s relevant for messaging apps, not social networks.
But then again I follow hastags first, then people I find through those hashtags.

Incus (formerly LXC/D, on which Docker used to be based on) is on my to-learn list.
Docker is not.

There’s squirrelmail.