You may have a different perspective, I've never had that feeling. But then, I was brought up reading war comics in the 60s and 70s, where both the Nazis and Japanese were portrayed as the enemy. In my first summer job, I worked with someone who would have nothing to do with anyone from Japan, because he had been a POW and couldn't forgive them for the way he was treated. The view from the US may be different because although the American forces were fighting the Japanese in the Pacific, they didn't have the same numbers of soldiers captured and mistreated as the British Empire did, with the fall of Singapore and Burma.
(That said, I can separate what the Japanese and German nations did in the 30s and 40s from what those nations stand for today. I've happily worked with colleagues in both countries for many years, spent three months living and working in Japan, and in fact now work for a Japanese company.)