President Eisenhower and I are pretty sure people of German descent weren't subject to a lot of bigotry during WWII or its aftermath.
The British royal family changed their name from Saxe-Coburg to Winsor after WWI due to rampant anti-German sentiment and public opinion. Not many years later, Japanese people were subject to abject amounts of racism and bigotry in the US during and following WWII.
And even today, the world still holds Germany responsible, and Germany collectively gets on bended knee every day begging for forgiveness, for what happened in WWII. Nobody says, "oh, it was just Hitler and a few crazy people." The Nazis were widely supported throughout Germany, Jewish bigotry was practiced by many, many Germans, and everybody knows all of this. And as a result, the country and its people pay the price for that war.
If the German people still showed a penchant for Nazi-era policy and were radicalizing their young men in that direction to the degree you see in the Middle East, you bet your ass there would be wide-spread bigotry towards German people. There would be a loud and collective, "there those fuckers go again." As it played out, we? collectively blasted the Nazi out of their systems once and for all and they've behaved wonderfully, building a great economy and focusing on engineering nice cars, producing good porn, and brewing good beer. Let them even feign a desire to invade Poland again and watch what happens.
Nobody, nobody, nobody gave Germany and Germans a fucking pass. People looked cross-ways at them for fucking years after the war.