What is 'caucasity in UX'?

This snippet comes from a talk Vivianne Castillo gave at UXRConf 2022 on "The Caucasity of UX: An Overdue Conversation on Power, Privilege, and Accountability." The talk discussed how the dynamics of whiteness impact the UX community and our understanding of being human-centered — and the ways it’s led to harm within the UX Industry.