Racism, not neccesarily, discrimination, absolutely. They aren't the same and people should realize that.
I don't know how long you have been in or spent time in Hiroshima, but many Japanese consider it to be one of the most anti-foreigner places in Japan. Interstingly, almost every foreigner I talked to that had spent considerable time elsewhere in Japan considered Hiroshima to be one of if not the friendliest city in Japan.
During the spring and late summer the anti-gaijin wagons run buy the conservative parties are out in full force. Those parties also have more support from the area than in other regions. Though nobody will say why, I expect it is because of the bombing and also the close proximity of the US military base in Iwakuni.
While in Hiroshima I came across many bars that didn't allow foreigners. I also got a few derogatory looks because I was with my then girlfriend, now wife, who is Japanese. While there I was only asked about the bombing twice. Once was by a man who lost his younger brother to the bomb and it was more of a general question about war. My coworkers weren't so lucky. Two of them went to the aniversary remebrance ceremony and were invited by locals to a discussion about the bombing, and one was continually contacted for about a week afterwards. Another was sucker punched outside of a bar by a guy that was continuosly asking him about the bombing earlier in the night.
The most bizarre form of discrimination was being foisted on unsuspecting japanese women or vise versa by japanese guys. I don't know what it is but it seems nearly every Japanese guy expects foreign guys to be interested in Japanese women.