I would have to think about ideas. However, when my son was given a talk at school about consent, he came home feeling very disgruntled as though all boys had been called rapists.
We had a long talk and he gets it now. However, that was his initial reaction. It's incredibly common. Defence mode.
Sometimes, exercises that produce a surprising, yet irrefutable result is the eye-opener.
I don't have any specific ideas, but gender expectations, which are constantly reinforced, is definitely part of it. Boys must be masculine girls must be feminine.
That means boys have to be strong, powerful, competitive, girls have to be compliant, pretty, and supportive/willing.
Did you see the BBC no more boys and girls? By age seven the girls had low self-esteem and the boys could only express one emotion, which was anger. The producer connected it directly to prison statistics on violent crime and sexual crime.
Sorry if you already know all this and I'm teaching my grandmother to suck eggs, as it were.