The two sides of the coin - acceptance and rejection - are, I think, not related to any ego whatsoever. They are both aspects of the brain's "optimised efficiency algorithm". So many functions are hidden away from consciousness as background processes so they can happen faster. I think the big joke is that so many processes that do impinge on consciousness actually come from the same source. It is so much more efficient to believe what you believe, and reject what you don't believe, rather than consuming all that energy thinking!
Until, of course, something happens to shatter that belief system - and notice that they tend to shatter rather than melt away, like a fission reaction.