Cissexism
From wipipedia.org

Cissexism is the attitude of mind that retaining the sexual identity assigned at birth is superior to changing or attempting to change that identity (transsexualism). It may be regarded as a prejudice similar to sexism or racism.
A strong form of cissexism is sometimes called transphobia. In this case, someone may suffer discomfort, disgust, fear or anger when meeting or thinking about transsexuals.