Here is the rationalization of how they think it will work out. The use of the word heterosexism provides another leap. They have so far. So now it is refining the point to oppression if you disagree with homosexuality. You are prejudiced, you are homophobic, you are heterosexist and you are oppressing people.
Victimization is abuse.
Abuse leads to shame. If a homosexual feels shame, the reason is because he is a victim and is being abused by other people. So now if you make a judgment against a homosexual and his lifestyle and you seek not to make this society's ideal, to discourage this on a social basis, which is all right to do because this is a pluralistic society after all, then you are not only homophobic, you are guilty of heterosexism, which is a type of prejudice, which is a type of oppression, which is a form of victimization, which is a form of abuse. There it is for you. It's all spelled out.