There's a distinction between what Nicolosis is doing and what the pro-homosexual groups are doing. Nicolosis maintains there are recognizable characteristics that manifest in children who are "heading" toward homosexuality. He is objecting to people who tell a child he/she is a homosexual based on those same recognizable characteristics. The child will believe the diagnosis of adults and "accept" his/her homosexuality.
Nicolosis believes there are things that can be done to prevent the progression of homosexuality in the child.
And he is being proven correct and that is what puts these people into a major league hissy fit!