I can respect that Japanese culture is reserved.
I don't think the Japanese have any right to bear ill will to the U.S. over the atomic bombings.
The Imperial Japanese were engaging in the most horrific war crimes the world has ever seen all across Asia. They were murdering American POWs left and right--at a much higher rate than even the Germans. They were the first to attack the Americans, and not just at Pearl Harbor, but also in the Philippines, Wake Island, etc.
As an American, I feel guilty that we killed civilians, but those who were, at that time, carrying out one of the most vile campaigns to ever stain the history books have little right to complain about how they were fought back against.
If you need a refresher on that, you can read this:
https://medium.com/said-differently/why-does-japan-get-a-pass-on-wwii-9f43ce39877c
And if you don't see xenophobia or racism as something that shouldn't be fought against, we simply disagree. Racism is a scourge on any society it is found in. A person should never be judged for things beyond their control. That's a basic principle that transcends culture.
And I simply find it very hypocritical when a country benefits from a never-ending array of cultural products from countries like the U.S. and China, but then discriminates against the people from those countries. If it were consistent, and the Japanese weren't obsessed with our music, clothes, art, food, traditions, technology, etc., then maybe there would be a leg to stand on.
But how you can readily adopt everything of benefit, and then reject the creators of such things, is nonsensical. And if you need a reminder on just how much of Western and Chinese cultural influence there is in Japan, here you go:
https://aninjusticemag.com/debunking-the-myth-of-the-homogenous-culture-43ce5c543273