Harry knew Dumbledore had a lot on his plate. After all, Voldemort had fully returned, the Ministry of Magic constantly undermined him, and there was the Order of the Phoenix... but nobody wanted to be ignored.
That brief conversation with Dumbledore had released the resentment Harry had built up from being sidelined, shifting his mindset slightly.
Recently, the D.A. meetings, Umbridge's misfortunes, and the clever uses of Skiving Snackboxes had made Harry's life rather pleasant lately.
Chapter 956