This has no bearing on whether the idea is right or not, and shame on you for trying to shut down conversation by comparing adherents to child molesters.

he didnt try to shut down the conversation, he just pointed out a fairly shocking truth about one of the first gender scholars

Which was irrelevant, and intended to get people questioning whether thinking along the same lines would cause others to look at them the same way. "I don't want people to think I might be a child molester too... maybe I should keep these ideas to myself." It absolutely shuts down conversation.

Various societies throughout history have recognized gender identities as distinct from biological differences for about as long as there have been societies. That the modern English terms for those two categories emerged from academia is pretty irrelevant.