Make room for the other version
Ask what the other person understood before assuming that you are arguing about the same facts. For a message about how to tell friends you are choosing sobriety, use this factual base: explain what is changing, when it takes effect, what remains private, and any practical impact on them.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Share the news directly and invite only the questions or support you are ready to receive. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Agree on a testable next step
Do not make one recipient responsible for announcing it to everyone or defending your decision. Plan privacy, housing, medical, employment, and personal safety before disclosing a change that may trigger retaliation. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.