That's the basic misunderstanding that people have about decentralised networks:
They don't get it that once a message leaves your instance, you lost all control about it.
All this "Don't quote, don't reply, quiet public, followers only, opting out of indexing and search machines etc." is merely a recommendation, but cannot be enforced.
I always say: Only post what would do no harm to you if plastered it on a public bathroom's wall or take it to the police