Most of the times it’s those who criticize you are the ones responsible for your growth.
If you observe carefully, then the people who support you in everything you say and carry the same thoughts as you, are not responsible for any exponential growth. They are responsible for considerable and consistent growth, but gradual and linear at the same time. As much as there is a need of few people who remind of your true self and your ideologies, you need as many people, if not more, who give constructive or negative criticism about you and your work.
Once in a while you will find someone walking out of the blue and saying very mean things to you. They might not be true, yet those words are spoken in the worst way to hurt you. You make an effort sometimes to make the person understand while the other times you let go of such mean experiences. Whether or not you tackled it right at that moment, those words stay with you for long. Those words hurt you, but at the same you contemplate over the things said and make your intent as well as your delivery stronger than ever. Your performance leaps ten folds, with the aggression and the efforts you carry. You make consistent efforts and increase your persistent and quality. Then you reach to a point of success.
You look back from the place you stand and all you see is people who made you feel special in the moments of your low and the only people who spoke of mean words and negative things to you.
Hence when some body approaches with mean weapons of words in their hand, make sure to keep your sword ready, not to cut them but to sharpen your sword.