Good plan A.
For a plan B, If your parents don't understand why privacy is important on the internet they probably won't understand why the echos in your room don't seem to work. Say it's wifi can't reach the router, bend the cable so many times the wires break, "accidentally" become super clumsy with it and knock it over a bunch. This is absolutely a first world problem, it requires a first world solution.
I think the term you're looking for is called Sexual Dimorphism, and I have only ever heard edge-lord-feminists call it sexism. Most feminists that I have met acknowledge it.
Edit: to be clear while the conversation of gender equity is in part concerned about sexual dimorphism, the human species as a whole is sexually polymorphic. However the discussion of Turner's syndrome, Klinefelter's syndrome, ect is tangentially related.