With girls, you'll get the same corrective effect from an uncomfortable grimace as you would a wooden spoon.
I'll also add since this is about bullying, the type of bullying behaviours girls engage in is much less physical and a lot more underhanded. It's much harder to correctly identify who's the victim and who's the perpetrator.
Kids need "an approach" that helps them learn necessary boundaries. That approach differs by gender (I have both boys and girls and that's obvious)
E.g. if people were apt to believe girls preferred green peppers more often than boys, there will always be plenty who say "Well, having both girls and boys, I can concur". It could be true, it could be false, or the cause could be something else. E.g., because people think there are certain differences it shapes differences in development which lead to some of them actually being more common for nothing more than the sum of environmental factors - even if those biases only started as misconceptions.
Whichever it actually is, there will usually be large segments of the populations who would observe it to be conflicting things from an individual at-home view and it takes a lot of work & really good data to be able to make a meaningful claim about what and why differences exist.
