I found that things became much more pleasant on here when I blocked hexbear. I recently blocked lemmy.ml as well, but I may reverse that if I find that I’m missing too much good content.
I’m open to other ideas on how to mostly avoid people who love conflict or argue in bad faith.
There is an option for that, its called Defederation
I want to block the users as a group even if the instance at which I am registered does not defederate.
Some apps let you do that. Sync, for example, let’s you block instances (users included) on the client side.