Answer:
Dolphus Raymond means to say that when Scout and Dill will grow they will be less affected by the prejudices towards African Americans because it was done on a daily basis by whites towards blacks.
Explanation:
"To Kill A Mockingbird" is a "Pulitzer Prize" winning novel by Harper Lee, published in 1960. The novel is set during the times of the Great Depression of 1930. The protagonist of the novel is a young girl, Jean Louise (Scout) raised by a widowed father Atticus Finch.
Dolphus Raymond points out that Scout and Dill(friend of Finch's children) will change when they grow up. In Chapter 20, when Dill sees how Mr. Gilmer questions Tom Robinson, he cries and says, "it just makes me sick." At this time Dolphus Raymond says to Scout,
"Things haven't caught up with that one's instinct yet. Let him get a little older and he won't get sick and cry. Maybe things'll strike him as being---not quite right, say, but he won't cry, not when he gets a few years on him."
He means to say that when Scout and Dill will grow they will be less affected by the prejudices towards African Americans. Because in Maycomb, black people were treated with contempt by whites on a daily basis.