heterophobia

The fear or resentment of what is different.

Taguieff writes synonimically^([sic]) of racism and heterophobia (resentment of the different). […] Heterophobia seems to be a focused manifestation of a still wider phenomenon of anxiety aroused by the feeling that one has no control over the situation, […]

The fear or resentment of heterosexuals or heterosexuality.

[…] a panel of teenagers of LGBT parents […] voiced concern about what they called "heterophobia"—they wished their parents weren't so negative and distrusting of straight people. Even suggesting that heterophobia exists for these children understandably evokes angry and skeptical responses because homo-hostile people have used the same word to support a bogus claim that gay rights discrimination against heterosexuals.

Accusing a gay person of heterophobia is like accusing a Jew of Naziphobia.

The fear or resentment of the opposite sex.