Previously this kind of behaviour was always taken as a symptom that child sexual abuse was occurring.

Likely that is the case here but it's getting covered up because adults trans activists desperately need trans children to exist so they can claim they themselves were born that way.

Ignore kids getting raped so autogynephiliacs can get their hard-ons in the ladies room, such progress.

Edit: yep, if you look at how that little boy is dressed and posed he's definitely being abused. https://www.dailymail.co.uk/femail/article-9933533/Mother-25-says-transgender-daughter-8-girl.html