What about negative badge catagories:
- Rust (corresponds to Bronze)
- Earth (corresponds to Silver)
- Grave (corresponds to Gold)
or something like...
Nah. Nobody wants a "bad" badge. A "bad" badge would be a reprimand for unwanted behaviour. Would you want to continue to participate in a community that has singled you out like that? I don't think so.
SO works largely without reprimands (except for a very small number of users getting banned) I'm pretty sure it is one of the reasons why the tone is so friendly there.
This has been discussed before
The consensus is that negative badges are not desirable at all by the community.
Furthermore, this adds more focus on users and not answers. SO is primarily about the content.
If a user is problematic, we can flag them, but we don't want to stigmatize someone based on an arbitrary algorithm.