YouTube has permanently deleted a deceased psychological therapist’s account for using “hate speech,” citing a 1994 debate in which he referred to a book with the word “sissy” in the title.

“By silencing scientific debate they don’t like, YouTube is effectively shaping the public conversation about trauma and sexuality,” Joseph Nicolosi Jr., founder of the Reintegrative Therapy Association and son of the late Joseph Nicolosi Sr., told The Daily Signal in an emailed statement Wednesday.

“They’re only letting the public (and people who are struggling with their sexuality) hear one side of the discussion, and in doing so, they’re misleading the very same people they claim they want to protect—individuals who struggle with trauma and their sexuality,” Nicolosi added.