Everyone, all of us, have a racial bias. Even the ones who claim to be the most liberal of people are racially biased because as a society, we are all inclined to belong to racial groups and hence, prefer them.
Racism is not a binary. You’re not racist or a person who embraces everyone around them – there are degrees and levels, like there are with everything else. It is a spectrum of sorts with people who have had a diverse upbringing being the least racially biased. Watch this man explain you how that works: