No, it is not. You ever observe small children in a multicultural group? They’re not racist, because they have no concept of it, nor why you’d want to do that. They see each other as peers. Racism is taught.
Small children typically ignore race, but there does seem to be (at the very least) a cultural tendency towards racism as people move into adulthood. There is a good book about it called "Why are all the black kids sitting together in the cafeteria?" https://www.amazon.com/Black-Kids-Sitting-Together-Cafeteria...
People's characters need to be formed, I would at least argue, to overcome a normal tendency to be uncomfortable with difference.
Just because a certain behaviour doesn't show up in a certain stage of life, doesn't mean it isn't an inherent behaviour. Babies don't talk. Talking is still an inherent behaviour of humans.
Young children's social environment is almost entirely defined by their parents. You'd expect very little aggressive behaviour there.
No, it is not. You ever observe small children in a multicultural group? They’re not racist, because they have no concept of it, nor why you’d want to do that. They see each other as peers. Racism is taught.