One group proposes a challenge and ridicules those who refuse. I propose to make explicit the possibility of not joining without intimate explanations.
In the example, the organizer offers an alternative that does not expose the participant. The success of the challenge does not prove its safety or usefulness.
When the activity involves risk, humiliation, or unwanted spread of images, the group should stop and engage reliable adults. Membership should not depend on accepting every challenge chosen by the audience.