No one likes criticism, and why should we? By its very nature, criticism means that something is missing, that you have flaws, that someone has found you lacking. Even constructive criticism, given with every intent to help you rather than harm you, can plant seeds of doubt in your head. What if I can’t get better? What if I’m just not good enough?
Unfortunately, if you never receive criticism, you put yourself in the dangerous position of never improving. That’s fine if you’re the definitive expert at what you do, but for most of us, we’re working hard to get better at something every day. It would be great if we could criticize ourselves, but it generally takes an objective person to give us solid tips to improve.