So being exposed to actual people of different races, and being afforded more opportunity to form friendships and relationships with people of different races, actually makes kids less likely to have cross-racial interaction. To know them (members of other races) is to prefer to avoid them, seems to be the motto of children.

Kids are natural segregationists. Jesus commands us to be like children.

By the transitive property, Jesus commands unto us to be segregationists.

Notice that one of us is able to express thoughts clearly and succinctly. The other one is very wordy.