A substantial amount of the homophobia in our society can be laid at the door of Organized Religion. But then we had the sudden rise in the 1980's of the Religious Right. Now it was almost downright criminal , in their eyes. Homosexuals should all die, and would all go to hell. Impressionable young minds have grown up listening to this garbage, both directly and repeated by parents and local pastors.
Nobody is born homophobic.
And the homophobes of Generation X have learned this lesson all too well.