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They may not have real federation, but they do some things well
(i.imgflip.com)
Memes about the Fediverse
Other relevant communities:
Actually, just blocking them from being able to respond directly to comments between blocked users could be pretty useful.
If wanted the person could make a separate comment fighting perceived inaccuracies if so felt needed but would likely look petty in most cases and dissuade the practice.
I wonder what downsides could happen but still sounds pretty good if complicated an option.