The Meta.SE tour says:
Be part of the community that decides how the sites work
Any question that has to do with the Stack Exchange family of communities is fair game.
- Specific issues with the software that powers the Stack Exchange network
- Real problems or questions that you’ve encountered using this software
While we discourage opinions on our main sites, questions here are likely to generate discussion and involve opinions. That's okay!
However, you shouldn't ask about...
- Anything not directly related to the software that powers the Stack Exchange network
- Questions that require the expertise of a specific Stack Exchange community - these should be asked on that site's meta instead
Based on this, debating or proposing changes to network wide policies, like the Code of Conduct, is on topic.
However, a recent staff post stated explicitly that:
debating the core of the new rule ("please use stated pronouns") ... is off-topic, and we won't be entertaining those debates at this point and posts that aren't questions or requests for clarification may be deleted.
Please document this exception ("debating the core of the new rule") explicitly in the tour (and anywhere else this site's scope is documented) for accuracy and so that people don't make mistakes.