Stopping Elders Who Are Preaching Lies
One should use their best judgement as to what should be the best strategy in the current scenario. For instance, at times it would be better to wait for the moment to have an opportunity to talk to elder in isolation and at other times, it would be better to present your point openly to people (for example, just mentioning of this fact would suffice that in your understanding that particular narration is weak or fabricated, etc.) just so people should know the alternative viewpoint if its a sensitive matter. But in all circumstances, respect should be maintained.