Discussing a crab is not politics, but attributing to it a non-existent gender is intentionally contrary to most people's social beliefs (especially outside of the SV bubble) and is thus political. Calling it a normal boy or girl isn't.

If, however, some community members wish to do that, they open to others the option to speak their minds on the topic, including stating that such an action ought not to be taken because no such gender exists. Contrast this with how most "codes of conduct" are written: they would permit community members to speak in favor of such a decision but not against it, as doing so would be "hateful", "bigoted", or "exclusionary".