Instead of casting a slur on someone, there are many better ways to approach a situation. Perhaps you could offer constructive criticism, have an open and honest conversation, or simply decide not to engage with that person. Some antonyms for casting a slur on someone include complimenting, praising, extolling, and lauding. By using these positive approaches, you can maintain respect and generally improve your relationships with others. Remember that throwing insults and negativity only hurts others and yourself in the end. Choose to be kind and considerate, and you'll find that people will respond to you in the same way.