Just wondering what GD songs you're referring to. (Me and my Uncle?)
The racist stuff comes from the line, "In Birmingham they love the governor".
It led a lot of people to believe that the band agreed with the policies of Governor George Wallace, who was very pro-segregation.
However, the lines that immediately follow, "Boo, boo, boo!" and "We all did what we could do", actually point out that they were in direct opposition to Wallace.