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1st Feb is #GlobalSwitchDay
(media.piefed.social)
Today the first of Feb is Global Switch day, Spread awareness of the Fediverse in your communities.
You can also establish a user block though too, so if their comments in unblocked communities are making your experience less than ideal, just block that user.
That's not a terribly good user experience if a user doesn't want to interact with or see any comments from users of a particular instance, as then it would require the user to manually block hundreds of users over a long span of time.