Genderalisation
When someone makes a generalisation based on somebody's gender
Men are happier because they are paid better than women, is a most innacurate form of genderalisation.
Genderalisation
Any statement that exploits gender stereotypes, such as "Single mothers have difficulty finding childcare that suits their work hours." As if all single-parents are female and only female single parents have trouble finding suitable childcare arrangements. They can also be statements that insinuate all members of a gender are responsible for crimes committed by only a small percentage of people from that gender. Genderalisations usually help to maintain a gender stereotype that females benefit from.
To say that men and boys must learn not to rape is a typical genderalisation.