Gender Theory also includes Gender Identity/Gender Expression, which is confusing. In New York City, if you don’t address a person by their preferred pronoun and you operate an apartment or business, there could be legal problems.
"The NYCHRL requires employers and covered entities to use an individual’s preferred name, pronoun and title (e.g., Ms./Mrs.) regardless of the individual’s sex assigned at birth, anatomy, gender, medical history, appearance, or the sex indicated on the individual’s identification.
“Most individuals and many transgender people use female or male pronouns and titles. Some transgender and gender non-conforming people prefer to use pronouns other than he/him/his or she/her/hers, such as they/them/theirs or ze/hir. 10 Many transgender and gender non-conforming people choose to use a different name than the one they were given at birth.”
Full text: https://www1.nyc.gov/site/cchr/law/legal-guidances-gender-identity-expression.page#3.1