Very few Southerners openly defied segregation openly or avidly when the first "legal process" really began after Brown v. Board of Education, those that did for many decades prior were subject to severe harassment, labeled "scalawags", " carpetbaggers", "traitors to the South", or even worse racial epithets I can't repeat in a NFL fan site forum, threatened with lynching, moat times they were just beaten up, tarred and feathered like Freedmen's Bureau agents were during the Reconstruction period or Northern " carpet baggers". By the 1940's, Federal government had passed some pretty stringent anti-lynching laws via FDR so some hate groups like the KKK tended to stray away from doing it to prevent FBI law enforcement possibly taking any interest if too much sheet hit the fan.
Typically, in Jim Crow South, most of the most systemic racism, discrimination or crimes tended to happen in major cities like Atlanta, Birmingham, even New Orleans and less so in the rural, countryside areas. Not necessarily everywhere, but in some states like Tennessee, Georgia, Florida, and the Carolinas it was the case.
In the first decade of Third Reich's existence, which was when the regime was most popular and successful, very few Germans, even ardent left-wing SPD social Democrats didnt actively oppose Nazis rise to power simply because most of the party's leadership prevented armed conflict and because many Germans reasoned that Hitler was democratically elected, sure he cleverly or cynically manipulated the mechanism of democracy so he could destroy it but then again, the Nazis themselves, if one reads the pamphlets, articles, hate-filled rants in speeches from Hitler, Georbbels, Georing, and Hess, they explicitly told their audiences if they voted them in, they were voting for totalitarians, they were amazingly up front and candid in interviews what their initial plans were once they got into power and what they planned to do. The plan to eliminate Germany's (and European) Jews was an long-term, kind of "gradualist" process where industrialized slaughter in death camps didnt come along until Wannasee Conference in 1942 and after Hitler had already done a trial run in the T-4 euthanasia experiments on mentally ill, infirmed, psychological issues or serious mental disorders, essentially a more widespread, extreme interpretation of eugenics programs being used. If one tried to seriously protest Hitler's policies, more then likely they'd be denounced, ratted on by a co-worker, possibly a friend maybe even a "concerned" family member or relative who thought you were insane and reporting you to the Gestapo was for "your own good".
Most ordinary Germans supported Hitler's policies initially in the 1930's eliminating unemployment, poverty, economic situation, Germany's geopolitical standing being improved after the punitive, harsh IMHO, unfair reperations clause/payments in the Versailles Treaty(Germany wasnt solely to blame for starting WWI), the fact that German Jews lost their civil rights, homes, jobs, self-respect and pride, was unfortunate to them and maybe objectionable to some, but not worth rioting and protesting in the streets over for. And again, before WWII began, most German Jews werent even living in or hadnt been deported to foreign Polish ghettos, yet. And also, keep in mind antisemitism had existed in even respectable parts of German society and culture going back nearly a century before to Wagner's tims (mid 19th century) when German philosophers, intellectuals and politicians had periodically called for Jews to be removed from German cultural life. So, while overt antisemitism in Germany in the late 19th century wasnt as bad or overt as France or Russia, there was still a permanent undercurrent of these sentiments that existed, sort of dormant, waiting for some evil, charismatic idealogue to malevolently exploit skillfully.