My name is Addison DeWitt. My native habitat is the theater. In it I toil not, neither do I spin. I am a critic and commentator. I am essential to the theatre. — All About Eve

Giving criticism is easy, taking it is much more difficult.  But it’s an essential part of improvement and success.  Even if you have the personal integrity to look at your own work and be able to point out where you have done poorly, getting the perspective of someone else can show you things you never considered.

Of course, how comments are given makes a huge difference.  “You are crossing your thumbs when you bring your support hand up.” is better than “You’re holding it wrong!” or worse.  Criticism needs to be constructive and helpful if it is to be heeded.