Tennessee’s history during the Civil War is rather complex.
Tennessee was the last state to secede from the Union, and they didn’t secede until after Lincoln called for volunteers after Fort Sumpter. (Their vote to secede was more anti-war than pro-slavery) And even after secession, eastern Tennessee still supported the Union - Tennessee had as many volunteers fighting for the Union as the rest of the Confederate states combined.
Of course, they still have idiots in their state, but their racists like to ignore the portions of Tennessee’s history that don’t reflect their agendas.