Professionally criticism is essential in the way of improvement. However, it is not easy to accept negative comments.
In order to welcome criticism, evaluate yourself on a regular basis. If you identify your strengths and weaknesses, you’ll be more comfortable with your boss criticizing your job.
Don’t be on the defensive. Keep in mind that it’s not your inner person that is being criticized but only one aspect of your work.
Try to understand even if the comment doesn’t seem legit to you. Ask more explanations and precisions on what is wrong.
And don’t forget, mistakes are human!