You're right. If someone's words hurt us, the first problem is inside us. This is some complex or truth that we are afraid to admit. And when someone touches that sore spot, we become angry like a dog that has stepped on its tail. But to become invulnerable, we must first work on ourselves. Honestly admit for themselves their weaknesses and flaws. To deal with them or totally accept them. Then criticism will not touch you, will not touch the living. But the problem is, a lot of people can't be honest with themselves. They'd better look out for a reason. Too angry environment, too tactless neighbors, too hard time and era. But it's not my fault. It's kind of silly. If you are dissatisfied with something in yourself, then work, correct.
After all, man is the crown of nature, the most intelligent and perfect being on earth. And the possibilities of man are endless, if he wants to achieve something.