This is also something that most atheists can't 'handle'. They want to believe in a world that can be identified, precisely, and quantified and measured, and tested, They want truth to be binary: is or is not..,. And so they tend to dismiss, or even disdain the idea of an intuitive, subjectively experienced reality. A reality in which the facts are not truth, but relative functionality. A reality in which evidence is subjectively experienced, subjectively defined, and subjectively evaluated. And that what one believes reality is, is what reality is regardless of what anyone else believes it is.
But this is not the world experienced by we humans. And so for all the "humanism" these atheists claim they believe in, they tend to disregard, dismiss and disparage the very things that define us as human, and that make being human such an amazing and unique experience. And I think this causes a lot of dissonance, and frustration and resentment for those who see themselves as "hard core" atheists. They are at war with their own subjective nature.
By the way, there are plenty of hyper-theists that fall into the very same intellectual trap.