Can you explain the poem incident capture the complex and indelible psychological impact of racism?

The poem captures the innocent thoughts and the indescribable pain he must have felt. Like as a small child when you think that a person in the store is your parent and you follow them for a few isles and then suddenly realize that they aren't who you thought they were. The child in the poem must have felt something like that, a sudden realization of something he was not aware of before that the whole world was thinking.