You’ve gone against the grain here and said essentially that it is right to challenge children/teens aged 12+ in the woman’s toilets.
What grain? We are all women, discussing your OP. We are not an organisation.
The rationale for this seems to be a fear of teenage rapists. No. As ever, the 'rationale' is that sometime sex matters and single sex spaces are required. The existence of teen rapists is one reason why!
So, presumably because you think confronting masculine seeming children in the women’s toilets is the right thing to do, is this something you have done or would do? That's pretty much the same "So we have shown" malarkey in the article you posted. See also "When did you stop beating your wife?"
Single sex spaces need to remain single sex. The only people who transgress this are people who need to be ejected from such spaces. Male, female, old or young!
And why do you think searching out the child’s parents is not a feasible course of action? I refer you to the Ludon County case.
Do you consider yourself a GC feminist? If not, then is there a particular type of feminism that you do consider yourself to align with? Why? Are women without any particular politics not to be heard?