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@Claire @helene @trwnh Fedibird's specification excludes from view emoji reactions of users who are muted and blocked by the viewer.
It is not possible to remove specific emoji reactions. federation is difficult.
I'd like to refer to the implementation there because it has the same problem as the mechanism to reject replies.
Pleroma/Akkoma also have the MRF feature, which allows programming filters and modifiers for each activity (which can be EmojiReact, matching user, emoji names, instances, files hashes, etc), which helps us a lot. I'm not sure how that would work in Mastodon, however!