cisgenderist

Relating to or characterized by cisgenderism ("attitudes or beliefs that privilege cisgender people or perspectives over transgender ones").

Their results showed that cisgenderist language is commonplace in professional communications between psychologists about children who self-defined their gender, that the most pathologizing language is found in literature by mental health professionals, and that those most closely tied to the most prolific author in the field through publication are most likely to use language that pathologizes and misgenders children.

One who believes in or advocates for cisgenderism.

Real gender self-determination would lead only to more 'legal men with wombs' and 'legal women with meat penises' – and persons of uncertain gender and unreadable bodies, leaving cisgenderists without a 'panic' defence.