Liza Donnelly is a cartoonist and she explain in her speech that humor is a very good thing to change things. Her idea is to make change mentalities on which we base from our birth. For her, it's important to make understand to people and to make them realize the stupidity of the rules of the life because of the society which we live for a long time and something without realizing it. In fact, it's ludicrous to base these rules of life about the sex : because you are a boy or because you are a girl. Thus, to try change it, Liza found a solution : The Humor. To change certain prejudices. The central idea of this speech is the important and the strength of the relation and the union : woman and humor.
I agree with her way of makes, indeed it's easier to pass on a message by a cartoon and what's more a funny cartoon. It's the way we live and habits which make that : we buy rather a fire truck for a boy and a baby doll for a girl.
Children have a lot of imagination so if we let them play alone without guiding theirs games, it's possible that a girl plays with a car or that a boy dresses up as princess. Liza understood it, and drawing humor, her message is too powerful for people, particularly for women. Thanks to Liza's sketch, people can see these rules but these rules attributed to persons according to their sex exist since generations, so I think that even by funny drawings, it not going to change. For a long time, it's like that and I think it's difficult to lose habits.
About the humor according to the culture, I think it's also depends on each. In certain cultures, there are importances, and conservatives values which there isn't in the others cultures. I think that the humor depends above all of the mentality of the person, of the family.