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Heterosexism?
From Wiki:
Heterosexism is a term denoting the presumption that everyone is heterosexual and/or the belief that heterosexual people are naturally superior to homosexual and bisexual people. Heterosexism also encompasses discrimination and prejudice in favor of heterosexual people over gay, lesbian, bisexual, and transgender people. As a predisposition toward heterosexuals and heterosexuality, heterosexism has been described as being "encoded into and characteristic of the major social, cultural, and economic institutions of our society."[1]
Heterosexism thus includes the underlying beliefs and attitudes of such preference. Stemming from the essentialist cultural notion that maleness-masculinity and femaleness-femininity are complementary, heterosexism is not limited to heterosexuals; people of any sexual orientation, including gay men, lesbians or bisexuals, can hold heterosexist beliefs."
Unreal.
Who ever came up with that crazy notion? /s