The phrase "they disrespect sacred cows" refers to people who "iconoclasts." Iconoclasts are individuals who challenge, question, or disrespect established beliefs, customs, or institutions that are widely respected or considered immune from criticism. The term "sacred cow" is an idiom for something that is immune from question or criticism, often unreasonably so, based on the reverence for cows in Hinduism. To disrespect or "slay sacred cows" means to challenge or reject these untouchable ideas or traditions.
In summary, "they disrespect sacred cows" can be expressed as "iconoclasts," meaning those who defy or criticize established, unquestioned norms or beliefs.
