One other thought-I think for me, sometimes criticism is disorienting if it is completely at odds with my perceptions. While of course, I suppose it's difficult for one to completely separate ego, I don't think that's completely what drives my reaction. Rather, it's disconcerting to think that everything that are normally reliable ways by which to perceive and navigate the world are no longer trustworthy. If someone told me that I was mistakenly perceiving something as red, which was in reality yellow, I wouldn't just accept that statement immediately because up till this point my eyes have always been dependable. However, if you offered me an explanation for why your perception is reliable, the consequences my mid perception might have, Oran explanation of how a previously reliable sense now longer is, then I'll go and investigate, talk to others and reconsider.
During grad school I taught a class which the students were required to take and didn't want to. No one had been successful with it before, and I was given little guidance. I had no experience teaching at that level, but my emotional intelligence is decent and I thought I had a decent read on how people were responding in the class. When my reviews came out and were brutal, the devastation for me was not just embarrassment at having not delivered what my boss wanted, but rather that my perceptions were so off. I lost all confidence in anything I previously thought to be true about myself or my interactions with people. It was one of the scariest times in my whole life.
Now, 8 or 9 years later, I can much better separate out what I was responsible for, and what I was not. The fact that I wasn't a perfect prof, wasn't the issue, but rather trying to figure out what was my faulty perception and what was factors which had nothing to do with my teaching ability.