What should I do so I'm not angry anymore?

Don't let people like these rent space in your head. Everybody probably thinks he is an a hole not just you! You will have to deal with people like this when you go out in the work force..a good trick when they are talking maintain a facial expression that you are really listening and imagine Charlie Brown's teacher whom whom whom blah blah blah, and when they are done ranting smile and act like you heard it and say "Thank you for the advice". Although sometimes criticism if it's constructive even we hate it helps us improve ourselves..so make he distinction.