Sexy Sadie by The Beatles is a song that reflects John Lennon's disillusionment with Maharishi Mahesh Yogi, who he felt falsely promised spiritual enlightenment. The song is a critique of perceived hypocrisy and false promises, showing a sense of betrayal. Themes of disillusionment, betrayal, and lost trust are evident throughout the lyrics. Key moments include the repetitive phrase 'Sexy Sadie, what have you done?' which highlights the feeling of being misled, and 'You made a fool of everyone,' emphasizing the sense of collective disappointment.