They are really very anti-war, and I don't see why a rational person would fear them at this point. The Chinese government is using its state-controlled propaganda machine to manipulate its subjects and whip up anti-Japanese sentiments for its own reasons.
And it is perfectly clear those reasons mostly relate to the desire of China to keep Japan off the UNSC.
What I don't understand is why China believes this will work. All the protests and attempts to get the world to remember that Japan was bad 65 years ago does not have a measurable impact on the world's opinion or Japan's chances in the UN. Maybe the Chinese leadership doesn't believe this will work, is resigned to Japan's success, and is simply trying to score a few points with their own people with xenophobia.