I was recently at a lecture given by Professor Xu Xin of Nanjing University in China. The topic of the lecture was "The Jewish Diaspora in Modern China". Professor Xin covered the brief but nonetheless important role of some Jewish communities in China, and how they fit in with some of broader Jewish and Chinese history.
During the questions portion of the lecture someone asked Professor Xin why the Japanese, allies of the Nazis tolerated Jewish emigration from Europe to China during WW2 if the Japanese knew of the Nazi's plans with the Jews? Professor Xin offered an anecdote about how the Japanese, who were not fully understanding of the Nazi animosity towards Jews, gathered some prominent Jews that were in the area and asked them why the Nazis hated them so much. The Jews told the japanese "it's because we are Asian". That got a laugh from the crowd, since Professor Xin had framed the lecture earlier by mentioning that Israel could geographically be considered part of Asia.
(I am not sure if the humor comes across well in writing so I will explain it:) The joke was that the Jews understood that the Japanese, the ones asking them the question, were Asian. So by linking the Jews to Asia they would be suggesting that perhaps the Nazis might have it out for the Japanese as well, and as a result the Japanese would not be so keen on helping the Nazis.
My question is: is there a reliable primary or secondary source for this anecdote?
P.S. Could someone please help me give this question appropriate tags