I Love You, Beth Cooper (2009)

When Dennis Cooverman gives the commencement speech at his graduation, his friend tells him to let it all out. So he proclaims his love for head cheerleader Beth Cooper and says things about everyone in the graduating class as well as some other people. Later Beth confronts him and he invites her to his graduation party; to his surprise she and two of her friends actually do show up. But so do some of the people he offended with his speech, wanting to tear him apart; one of them is Beth's boyfriend, who has just dumped him.