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If you blocked the triad (lemmygrad, hexbear and lemmy.ml) you could avoid them. They started to create accounts on other instances, so this recommendation doesn't work anymore.
The user labeling feature of voyager is very useful, mark the ones you don't want to debate. I found it's very few users who actually spread their bullshit outside political communities, so ignore political comms on lemmy, they only debate about amerikan stuff there anyway.