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 celebrate a friend's sober anniversary, use this factual base: use the person's own language for recovery, name the practical concern, and distinguish a lapse from what you do not know.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Offer a specific sober or practical support option and encourage connection with qualified help. 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 shame, bargain, lend money without limits, or make your relationship the reward for recovery. For overdose, dangerous withdrawal, suicidal intent, violence, or immediate risk, contact emergency or crisis services now. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.