EDIT: no, I don't sympathize with nazis (neither I sympathize with those who call everyone nazi when they're losing an argument ;)
Defederate literally everyone. Defederate servers because you don't like the color of the admin's hair. My lemmy app supports multiple accounts, defederation has the tiniest possible impact on my user experience and is good for you as an instance owner. Defederate. Defederate. God Almighty, defederate. That's wtf the option is there for.