Honestly I think a big contributor to this way of thinking is a lack of education. Everyone is to blame, schools, parents, mentors and the media. The whole system is setup by people who are trying to enslave the world. The problem of gender bias is only a symptom of a greater threat to this world. If you really want to fix this problem fixing the root of the problem is the only way. The people controlling this world are trying to create an education gap between castes.