I think the important point to make is that criticism is good when constructive. It should be sought out, and to make this a most worthwhile activity; you should first work on your emotional intelligence, do this so that you are well equipped not just to seek out but listen without getting too emotional and then take the most appropriate action to improve.
Constructive criticism is essential for creativity, innovation and problem-solving. Since leadership requires all three, leaders need to be sure not only that they are open to criticism but that they actively seek it out.
Don’t simply ask for general feedback but ask people, including your customers, for constructive feedback; ask them to poke holes in your ideas and approaches to business. Critique can be a very useful approach to test ideas and keep people and teams on track and accountable.