How to use pain as fuel to drive you when somebody puts you down?

Like let's say this jerk pointed out all your flaws. It's stuff that can be improved. How do you use the pain as fuel to drive you in this situation? You want to improve yourself and look so hot that he realizes he made a huge mistake. But how do you get here? How do you use the pain as fuel to drive you instead of letting it totally destroy you? Please just answer the question instead of telling me stuff like I shouldn't listen to what he says or stuff like that. Thank you.