Never respond to rudeness. When people are rude to you, they reveal who they are, not who you are. Don't take it personally be silent. For more quotes and inspirations: http://www.lifehack.org/articles/communication/never-respond-rudeness.html?ref=pp
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.