Now you've metioned it, red vs. blue is very common in human history.
But red does not mean you are on the 'bad' side.
If you talk about the Russians, Chinese, and Communists in general... they will still think of themselves as Reds because their flags are red. Red is a very important color for the revolution.
Red is a happy and auspicious color for Asians. In stock markets in Hong Kong, China, Taiwan, Japan. When the stock price is up... it is collored red.
Just to add the 'Axis' is not an evil term. It is actually what fascists call their alliances during World War II. Oh didn't you notice that the Nazi and Japanese flags are predominantly red? Italy has some red and no trace of blue. :D USA, UK, France has traces of blue. So it's another case of Blue vs. Red... except for the the Russians that are Red and part of the Allies.