I agree but what I don't understand is why being cisgender and heterosexual implies homophobia
It's because cishet's are all raised on it, so are trans and gay people and the result is we hate ourselves, deny being anything other then cishet or have to unlearn this behaviour.
Cishet's being cishet's aren't directly effected or really effected personally at all by a society raised on homophobia and cisheteronormativity. Infact they benefit from this immensely. Thus they are ignorant, or simply don't care, not like non-cishet people do as it effects us directly we must unlearn the homophobia we were taught.
But cishet's don't and are inherently homophobic because you no matter what will always benefit from society's homophobia and oppression of non-cishet people if society continues like this. Always.
So even if a cishet person is educated and does their best to unlearn this toxic shit they will still be inherently homophobic.
That and I have never never met a cishet who wasn't at some level homophobic. And no other non-cishet has.