It was just Batman being a dick. It didn't need to be accurate, the point was that everyone was just being ****s to each other. It wasn't all that accurate that Diana lost her way or whatever either, but it was just what the three -- and by meta-extention, casual comic book readers -- thought of the other at the moment.
Anyone who's actually been reading those books up to that point knew that Superman was still inspirational, and Wonder Woman was still humane, and Batman was still rational. But that didn't stop those criticisms from being the biggest things that the fandom perceived. We all know what I'm talking about; "Superman's too soft and not proactive enough! Wonder Woman's too unrelatable and godlike! Batman's a meanie and a lunatic!" The great DC Trinity of p***y, ***hole, and dick. It didn't matter that it wasn't true, the masses still cited it.
And all of this was just Johns' way of portraying that perception, addressing that perception...and maybe fixing the perception. Whether or not it actually worked is up for debate, but the entirety of Infinite Crisis was just one giant meta-examination of comics, comicbook characters, and of the fandom.