Personally, I think that person was full of it. I am convinced that not only was he full of it, but also that he knew that he was full of it. He was not interested in truth, just in what he could get.
So much of what is said about this subject nowdays is merely recruitment.
You may be right about the bi-sexual thing. That would lead me to believe that early sexual experiences can shape one's orientation. I recently became aware of just such a situation that resulted in a so-called "bi-sexual" frame of reference.
The fact that homosexuals activly attact NARTH should make all parents give them at least a look.
He did not say homeschool, he said "be aware". Narth has been around for some time, they are among the few organizations that publicly take the position that homosexuality is learned.
Why do parents homeschool? Among the many reasons is that public schools provide bad role models. Seems like nothing anti-homschool to say children need proper rolemodels.