We also have a related concept of gender binarism (or in some uses, genderism (such as here, here) (though genderism can also apparently mean the opposite thing, to negatively describe gender-non-binarism(?), or what is referred to as “gender ideology” by people with “anti-gender” prejudice)) to describe specifically discrimination of “gender nonconfirming” (or non-binary-gendered) individuals (rather than transphobia or LGBTphobia for the same lexical confusion theoretically). Anti-genderism also makes sense as a term for this, I suppose. Anti-LGBTism ([Anti-LGBT rhetoric](Anti-LGBTism [en.wikipedia.org/wiki/Anti-LGBT_rhetoric)) could also work as a term for discrimination against LGBT people in general (horrific paper).
I also found a term, HOCD, which can mean excessive fear of becoming or being homosexual, though it can also literally means a form of OCD relating to homosexuality, but it’s the closest thing to “fear of homosexuality” (“FOHO”?) that I found, albeit a form that only applies to a fear around one’s own possible homosexuality rather than a fear of homosexuality in general regardless of one’s own sexuality.