We are born racist. To think otherwise is a guilt-defensive tactic, a delusional salve.
Due to our ancestral brain we can only easily process up to 150 people in social cognition and communication. The brain always strives for the familiar and is wary of unfamiliar strangers.
For millenia, humans have extended social cognition to family, extended family, tribe and village. If a stranger has features that do not match the familiar (skin colour, body structure, facial structure, language, accent within the same language, gestures, habits, clothing, etc), the brain treats them as "other","outsider", "potential foe". This triggers both the "friend or foe" and the "fight or flight" imperatives. Neither imperative leads to progress in race relations. We must consciously learn to bypass these ancestral brain imperatives.
For each and every generation, we are born ignorant and egocentric and must be taught how to learn and how to share. We are born racist and must be taught how to accept.