Undergraduate science, technology, engineering, and mathematics (STEM) classrooms are not race-neutral spaces, and instructors have the power to center racial equity and inclusion in their instructional practices. Yet how instructors think about race and racism can impact whether and how they adopt inclusive practices. We examined how 39 undergraduate STEM instructors noticed anti-Black racialized events that were experienced by students in classroom narratives. We created narrative cases that described multiple common, harmful anti-Black racialized experiences based on extant research and guidance from an expert advisory board. Instructors responded to cases by describing the problems they noticed. Using frameworks of racial noticing and color-evasive racial ideology, we conducted qualitative content analysis of instructor responses. Color-evasive racial ideology was pervasive, with most responses (54%) avoiding any discussion of race, and few responses acknowledging race or racism in more than one event (10%). We characterized six forms of color-evasiveness. This study adds to a growing body of literature indicating that color-evasion is pervasive in STEM culture. Instructors would benefit from professional development that specifically aims to counter color-evasiveness and anti-Blackness in teaching. Furthermore, STEM disciplines must pursue systemic change so that our organizations value, expect, promote, and reward the development and enactment of a critical racial consciousness.