Would pronouns count as "sensitive data" under GDPR? And would it therefore be fine to volunteer them and not for employers to require them, especially to require them to be advertised in communications?
One transactivist has certainly worried about this before!
twitter.com/miss_s_b/status/976379005921357825
The definition of sensitive personal data under GDPR is data consisting of racial or ethnic origin, political opinions, religious or philosophical beliefs, or trade union membership, genetic data, biometric data, data concerning health or data concerning a natural person's sex life or sexual orientation.
www.burges-salmon.com/news-and-insight/legal-updates/gdpr-personal-data-and-sensitive-personal-data/
If your pronouns are held to reflect your inner psychological state of "gender identity", they might count as at least one of
*Privileged medical data under both the Data Protection Act as they disclose information that only a mental health professional might normally know. Compare the state of "feeling female", if that is indeed possible, to the state of feeling depressed.
*A privileged political opinion, religious or philosophical belief, namely that gender identity is something you can or cannot have. If you have the philosophical belief that you cannot determine your own pronouns, asking you for your pronouns forces you to disclose this sensitive data, and requiring them may also force you to lie (in breach of EHR article 9).
The corollary is that any organisation which stores pronouns would also be in receipt of such sensitive medical or philosophical information and would be counted as a data controller under the GDPR, and must obey the conditions for processing sensitive data (broadly, that the storage must be necessary for carrying out obligations), with very large fines issued for breaches. Organisations must issue extensive record keeping principles to show they are satisfying the principle of lawful processing. See:
www.burges-salmon.com/news-and-insight/legal-updates/gdpr-data-protection-principles/
This has not been tested in court and is my general ignorant musing interpretation only. Just throwing it out there!