How to Have a Thick Skin
Step 1. To dull the sting after a mean comment, your automatic reaction should be that the comment says more about the comment-maker than it says about you. Remember that they are not saying this about the real you (if such a thing exists), but the you that they perceive.
Step 2. If you can psychologically detach from the conflict like that, negative comments are easy to shrug off. However, if you remained at that step, you would never learn from legitimate criticism. The second thing you should do is figure out why the person said this.
Step 3. If the comment had no basis in reality, was only intended to cause you pain, was based on a misunderstanding, or was about something you have no control over, then it’s meaningless. Ignore it. If, on the other hand, there is something real to the comment, it could merit further consideration.
Step 4. If the comment was coming from an honest place, or at least partially honest, the question becomes whether you disagree with the comment and have good reason for doing so, or if you should take the comment to heart and change in some way. If you disagree, articulate to yourself why you disagree — why your behavior, statement or trait being criticized is the way it is and should stay that way. If it’s merely a disagreement, there is nothing for you to be upset about. It’s just a difference in opinion.
Step 5. If the person making the rude comment is right, make the appropriate adjustments.