I work in a office with a non-Jew who told me an halacha she heard from a Jew at her previous place of employment. If that halacha is not accurate, can I tell her that it’s not true, or am I showing disrespect to that other Jew in from of a non-Jew by doing that?
Answer:
You can tell her, if you think there is there is value in so doing, that the halacha is not true, but ensure you do so in a respectful way.
For instance, you can tell her that with all due respect (etc.), the halacha might be a little more complex than the person in question thought (etc.), and therefore it isn’t quite as she thinks.
In general, I imagine there won’t be much value in pointing out the mistake, but this will depend of course on circumstances.
Best wishes.