Shame
Things that are seen as shameful
Shame is one of the most powerful regulators of social behaviour, and its targets vary so much across cultures that what destroys a reputation in one place barely registers in another.
Every culture uses shame to protect what it values most: family honour, individual dignity, group loyalty, religious purity, professional competence, or something else. The trigger differs, but the mechanism is similar: a sense that you have fallen short of what your community expects, and that others know it. Understanding what carries shame in a given culture is a fast route to understanding that culture's deepest priorities.
Shame operates at different scales. Some cultures orient more around an individual's own sense of having failed their values (sometimes called guilt-based systems), while others place more weight on how the community perceives and responds to the failure (sometimes called shame-based systems). This is a rough and much-debated distinction, but it is useful for noticing that the same act can trigger very different consequences depending on whether the damage is primarily internal or primarily social.