The ego is the idea of the TOTAL opposite of God. It is vile bitter hatred and death and darkness.
Usually, however, we are not really aware of just how vicious it is, because it hides most of its viciousness behind the persona, which covers up most of the "special hate" with "special love" and other illusions of things being okay.
The world we live in is largely populated by personas and fake identities all colluding together to repress and hide and reject everything that they deem unacceptable. They shove all of this hatred and darkness into the 'shadow' which is the more unconscious, more opposed-to-God aspect of the ego.
Sometimes, when you work on becoming more authentic, you are dissolving the persona and undoing the fake sense of identity it contains. As you do this, however, it's going to 'unmask' the ego. It's taking the covers off the repressed vicious darkness that lurks under the surface.
Now, in regular day-to-day interactions most people are quite fake and they will not genuinely, authentically or fully express how they 'really feel', regardless of what that feeling is. So a lot of actually genuine feelings become heavily repressed and stuck in the unconscious layers of the ego. These feelings might actually be more genuine than you realize, because they might express how someone actually DID betray you, or how someone actually WAS being dishonest, or how you really DID feel victimized... given that you probably instead covered up these 'genuine' awarenesses for the sake of saving face or not confronting people or people-pleasing or whatever other persona-tactic you were using.
So then when the ego persona mask comes off, even temporarily, it can sometimes trigger the exposure of and 'release of', or shine a light upon, the darker hidden repressed expressions of yourself. The shadow self. This is where the vicious ego experiences a much more immediate and unfiltered engagement with every form of negativity. So all of those repressed feelings, regardless of their subject matter or justification, start to flood out. They flood into the conscious mind and take it over and make the mind become unconscious, meaning that you are put into the dark, cannot see, cannot think clearly, lose sight of what is real, become lost in intense negative delusions and can't see past these strong feelings.
So these strong negative feelings arise, as all the feelings you repressed and didn't experience due to the persona saying it was not 'appropriate' or 'allowed' or 'acceptable' at the time, or due to you holding onto them for some reason. And so then the person experiencing this might start to point out much more bluntly how other people suck, how other people are deceptive, how other people are liars, how other people are haters, how other people are victimizers, etc... all the repressed feelings which might actually have had a basis in 'reality' of some kind, start to flood out. And it can be extremely negative. But these are, if you like, genuine feelings, which really are trying to be released and fully processed.
So what we then have to do is become willing to find ways to actually be more authentic, to be more real, and to make it okay and acceptable and allowed to have these negative feelings, at least so that you can fully feel and process them and release them. Fuck society if they don't like it or its not appropriate, society is completely fake anyway. So this release of 'darkness' is really a release that's asking for healing and light and forgiveness and acknowledgement. When seen as such we can become willing to let go and allow and accept this darkness of the furthest extremes of the ego, and instead of fighting with or trying to repress or get away from it, find instead ways to transcend it and transmute it and transform because of it. And this can produce awakening.