Intelligent people ignore...Yes. Let it go, and move on with your life. Then amazingly one day you realize you haven't thought about that negative situation, or that jealous, vindictive person in like forever, and you think, "WOW!! What was her name.
Don't hold onto anger. Don't blame others for your mistakes. Apologize for your mistake, learn from it. From that point on, it's really out of your hands.