heterosexism
n. prejudice against any nonheterosexual form of behavior, relationship, or community, particularly the denigration of lesbians, gay men, and those who are bisexual or transgender. Whereas homophobia generally refers to an individual’s fear or dread of gay men or lesbians, heterosexism denotes a wider system of beliefs, attitudes, and institutional structures that attach value to heterosexuality and disparage alternative sexual behavior and orientation. See also heteronormativity.