I was yelled at once by a drunk old guy in Japan when I was there travelling on vacation. He said something about WWII, but I didn't understand what he was getting at. It didn't bother me though. The other time I got WWII brought up was when I was in Akihabara and there was a guy on the street with a clipboard approaching Americans saying in English that he wanted money for victims of Nagasaki and Hiroshima. I don't play around with scammers, so I just pretended I didn't understand English.
At the bars in Roppongi, the Americans (mostly soldiers) were very well behaved, much better so than the local Japanese who were hanging out there. The local guys basically mistreated the Japanese women who went to the bars, presumably because they disapproved of them being interested in meeting American men. These locals would basically treat them like *****, try to pour beer on them, grab their breasts, et cetera. It was very confusing.