Related terms include cisgender, transphobia, transmisogyny, heterosexism and cisnormativity.
"My father made a lot of very cissexist remarks when he found out that my partner is transgender. "
Cissexism is the belief that transgender people are inherently inferior to cisgender people. It is frequently observed in both conservative anti-LGBT circles and in TERF communities. Cissexism may or may not be conscious or deliberate on part of the person expressing or feeling it. Examples of cissexist behaviors include dismissing transgenderism as a phase, mental illness, or cry for attention, or considering transgender people to be "freaks,"
delusional, or sexual deviants.
Cissexism is closely related to, but distinct from, transphobia and transmisogny. It differs from transphobia in that it is part of a system of oppression (comparable to racism, ageism, and sexism) whereas transphobia more specifically refers to a feeling of disgust or hatred (comparable to xenophobia and homophobia). The terms are, however, sometimes used interchangeably and tend to overlap significantly.
The term cissexism was first used in the late 1990s by transgender rights activists and has become increasingly popular as part of the social justice movement and online transgender and trans-inclusive culture.