The immigrants and US citizens of Japanese descent were not the ones doing the imprisoning of US soldiers, so this is entirely irrelevant? Japanese Americans were also much hated by white farmers in California for their efforts to engage in labor organizing across race lines. They created the first interracial farm-workers union with Mexican laborers:

https://en.m.wikipedia.org/wiki/Japanese-Mexican_Labor_Assoc...

I don't understand your question. It was suggested upthread that Japanese internment of Europeans during the war implied that racism didn't animate the policy, based on a premise that the Japanese aren't racist. But the Japanese were, at the time, luridly, profoundly racist; they were during the war racist in the mold of Nazi Germany.