The social justice literature calls these liberals who believe they aren't racist, "good whites," and they are immensely frustrated with them. In fact, it's those people they spend most of their time calling racist. From the linked article (Source: DiAngelo, Robin. White Fragility: Why It’s So Hard for White People to Talk about Racism. Beacon Press, 2018, pp. 4–5.):

None of the white people whose actions I describe in this book would identify as racist. In fact, they would most likely identify as racially progressive and vehemently deny any complicity with racism. Yet all their responses illustrate white fragility and how it holds racism in place. These responses spur the daily frustrations and indignities people of color endure from white people who see themselves as open-minded and thus not racist. This book is intended for us, white progressives who so often—despite our conscious intentions—make life so difficult for people of color. I believe that white progressives cause the most daily damage to people of color. I define a white progressive as anyone who thinks he or she is not racist, or is less racist, or is in the “choir,” or already “gets it.” White progressives can be the most difficult for people of color because, to the degree we think we have arrived, we will put our energy into making sure other people see us as having arrived. None of our energy will be going into what we need to be doing for the rest of our lives: engaging in ongoing self-awareness, continuing education, relationship building, and actual antiracist practice. White progressives do indeed uphold and perpetrate racism, but our defensiveness and certitude make it virtually impossible to explain to us how we do so.