What should one do if they hear an inappropriate 'nude friend' story?

Ignore it. Don't participate in spreading such inappropriate information.

One should firmly refuse to spread it further. Ignoring it and distancing oneself from such inappropriate content is a good start.

If you hear such a story, the first thing is to recognize that it is inappropriate content. You should immediately distance yourself from it and not participate in any way in its dissemination. It might also be a good idea to encourage those around you to uphold good moral values and not engage in this kind of unethical behavior. If the situation seems more serious, for example, if it involves potential harm to the girl, it may be necessary to report it to the appropriate authorities.

One should immediately stop the person from telling it further. It's not acceptable to spread such stories.

One should firmly object to it. Let the person know that such stories are not acceptable in a civilized society.

First, you should realize that this is not a normal or acceptable situation. You can talk to the person sharing the story, if appropriate, and explain why this is wrong. Encourage them to focus on positive family interactions that are based on respect and healthy boundaries, like going on a picnic or playing family games together instead of this inappropriate scenario.

One should firmly distance themselves from such a story. It is not a healthy or positive topic. You can tell the person sharing it that this is inappropriate content.

One should immediately stop the person from sharing such inappropriate stories. It's important to set boundaries and make it clear that this kind of talk is unacceptable.

One should firmly stop the person from sharing it further. Politely but firmly make it clear that such content is unacceptable.

We should immediately stop it from being spread further. If it's false, we can try to correct those who are spreading it.