Ironically, what you just did proves why domains are a good grouping concept for (self-service) moderation, which is how federated communication protocols work by design. Nostr client devs could learn from this and allow users to mute all accounts of a NIP-05 domain at once.
(However, Nostr is still too small for this feature to be overly useful. Not enough users with enough different NIP-05 domains at the moment.)