Why did Mexican man interrupt Nobel ceremony?

Story here. Boys are routinely killed in Afghanistan, and we ignore it. Malala wins a Nobel Prize for getting in the way of a bullet. And what will she do with her money? Open a school for girls. Meanwhile, the world still ignores the missing Mexican students -- because they are men. This guy stood up to the sexism. Excerpt:

'At a prize ceremony honoring peace, Adán Cortés says violence and injustice sent him rushing toward the stage.

In a matter of seconds, the 21-year-old Mexican student's face was seen around the world last week as he stood in front of Malala Yousafzai at the Nobel Peace Prize ceremony in Oslo, Norway.

"Please Malala, Mexico," he repeated as he unfurled a Mexican flag on the stage at Oslo's City Hall, where the 17-year-old laureate was about to become the youngest person ever to receive the prestigious award.
...
"My motivation was to show solidarity with all the things that have happened in my country, ultimately, well, the 43 missing students, who are suspected to be dead and burned, that was my main motivation," he said. "I am tired of so many injustices that we have lived in Mexico, for decades."'