Cal and Stanford dont have issues with their peers in the Pac 12 in schools that think like them. There issues are with the rest of the country, schools, and states that they dont believe, fit their beliefs, politics, academics, and are not as elite as what they believe they are.
No one thinks they have an issue with the rest of the Pac schools. It is their issue with schools, in Texas, Iowa, Oklahoma, etc, and religious affiliated schools that they turn their noses up to. This is and has been well known for many years. Their beliefs are deep seeded and are tied to many issues. Whether they are realistic or not and whether they are based in truth or stereotypes, it does not matter, they have an extreme aversion to many schools because of their affiliation or location.