I have never encountered the reaction you describe. And I have had many discussions with a lot of Japanese folks on WWII as well as a number of other topics. Folks of all ages - from 12 years of age to 80 + years old.
I think your comment is far less than accurate. While one might well encounter a Japanese with hostility or ill-will resulting from our use of nuclear weapons...by that same token, a person like that isn't going to go out of their way to make buddy-buddy with someone they might despise.
While I do think Austrailia is a fine place to vacation, the topic here is Japan.
great,
just telling what i saw felt and was told.