genderism

A belief that gender is rigid, usually a belief that it is binary, comprising male and female, and that the aspects of a person's gender are inherently linked to their sex at birth.

Belief that one gender is superior; discrimination on the basis of gender. (Compare sexism.)

Opposition to traditional gender roles; belief that gender exists separate from sex; "gender ideology"; a variously-defined catch-all for things like transgender rights and feminism to which antigenderism is opposed.

A gendered or gender-stereotyped behaviour, activity or statement.