Ender uses the jeers of the onlookers as a teaching tool. what does this reveal about the character of ender?

It reveals that "he is creative and determined".

The story started with Ender Wiggin having his screen expelled. Ender was a splendid six-year-old kid; conceived as a third tyke in the United States that lone allowed groups of two kids each, therefore his presence itself required authorization from the administration.