A rumor needs you to react to stay alive. Starve it.

Stories spread on energy, and the loudest source of energy available is usually the person being talked about. Every denial, every screenshot, every response gives the thing another day of relevance and a new set of quotes. Left alone, most of it collapses within a couple of weeks because nothing is keeping it in motion.

If it is untrue and not dangerous, say nothing publicly and tell the few people who matter the real version directly. Keep living visibly and normally in front of everyone else. Check back in a month and notice how little survived.