Winston feels that Julia is far more acute than he is in regard to the Party propaganda. What point does she raise that Winston never considered?

In Part 2, Chapter 5, we hear a great deal about the the
ways in which Winston and Julia are different in their thinking and in the way that the
perceive things.  One of those differences has to do with the way that Julia looks at
the Party's propaganda.  She is much more inclined to disbelieve
everything that the Party
says.

The example that you are asking for has to do with
war.  Winston mentions the war between Oceania and Eurasia.  Julia says that she does
not believe that the war even exists.  Instead, she says, the government shoots rockets
into its own cities to keep the people afraid.

Here is the
passage that proves this:

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Once when he happened in some connexion to
mention the war against Eurasia, she startled him by saying casually that in her opinion
the war was not happening. The rocket bombs which fell daily on London were probably
fired by the Government of Oceania itself, 'just to keep people frightened'. This was an
idea that had literally never occurred to
him.