ACLU has a web form for submitting comments on this document:

https://www.regulations.gov/document/DOS/_FRDOC/_0001-6771

The offending part of that document:

To comply with E.O. 14168, “ Defending Women from Gender Ideology Extremism and Restoring Biological Truth to the Federal Government,” the Department updated the form to replace the term “gender” with “sex.” The U.S. Passport conforms with the standards set by the E.O. and the International Civil Aviation Organization, which among other things determine the various fields on the passport’s biographical data page. Consistent with the E.O., the revised DS-11 will request the applicant’s biological sex at birth, male “M” or female “F.” Amendments to the fields and instructions (section 3) have been made to reflect this.

If you’re concerned about having your name on record, you can submit comments anonymously on the federal register website: Application For Passport (DS-11), Renewal Application (DS-82), and Replacement, name change, correction (DS-5504).