Very often today hating light serves as separation within evangelicalism and fundamentalism. It's a different kind of separation, but it is separation. Darkness that hates light, I've found, separates too, but it's different than the doctrine of biblical separation. Darkness is repelled by light, the movement being away from light. Light must be scripture.
Biblical separation starts with pointing something out, attempting to change or reconcile, before separation occurs. It's pursuing something productive. It might not end well, but it's a process required in scripture.
Hating light has no obligation to light. Darkness is self indulgent. Light is a problem for it. It has no productive interest for the light. At worst, it wishes light to disappear and at best it retreats.
Even though hating light separates darkness from light, it doesn't take the same biblical proceeding. It takes a course antithetical to biblical separation. I've witnessed one of several directions in its flight from light.
It ignores -- the equivalent of turning to avoid painful squinting. Light doesn't do this. Darkness does. I've called it the cold shoulder treatment. No form of biblical separation jumps to ignorance. Darkness doesn't want anything to do with light, so it ignores light.
The hating of light also manifests in some kind of destruction of light. It's not welcoming light. It wants light to disappear or become part of darkness.
You can know light by what it does to darkness. When light shines on light, it's accepted. When it shines on darkness, it's not.
My experience with evangelicalism completely and most of fundamentalism has been something in the realm of darkness as it relates to separation. I confront with light and the reaction is like that of darkness, not light.