Agreed.
He could start with forced busing and forced integration that has failed miserably at the cost of billions of dollars. Such forced integration has never worked and never will as witnessed by the differences in schools in the urban and suburban areas where "natural segregation" has resulted in continuing white flight, which doesn't help the blacks at all.
He could have also said that forced integration has lead to more strife and segregation between the races than ever before.
You're right, he should have and could have said more. But then again, he would have been villified for telling the truth.
He ran on an anti-government platform, not a racist platform. He opposed the intervention of the federal government in the affairs of the states. He was only being true to his Southern heritage in doing so.
To wish to live with people of similar beliefs and goals is not racist; it's natural (i.e., "Birds of a feather..."). Racism is the taking of action against someone based upon their race.
Forced integration, on the other hand, is not natural and is in direct opposition to the Constitution as well as natural law.