Internalized homophobia is the lowest level of bias against homosexuality, usually manifesting as a self-hatred and/or denialism of one's own orientation. The cause, as with all internalized oppression, is due to cultural-level norms, in this case heterosexism.
It is most often cis white men who are publicly documented to suffer from internalized homophobia and biphobia. This is for a variety of intersectional reasons including sexism (women and gender-variant people have fewer positions of power), racism and media bias. This is not to imply that lesbians are not affected by internalized homophobia, as the actual case is quite the opposite.
- Iain R. Williamson. Internalized homophobia and health issues affecting lesbians and gay men. Health Educ. Res. (2000) 15 (1): 97-107 doi:10.1093/her/15.1.97