Fawning upon means showing excessive flattery or subservience, and antonyms for this term would include words like challenging, resisting, rebuffing, opposing, or confronting. Instead of fawning upon someone, one could challenge them to think critically, resist their charms and manipulate them, rebuff their attempts to gain favor, or confront them about their behavior. These antonyms all suggest a more independent and strong-willed approach to interacting with others, rather than being a passive follower seeking approval. By using these antonyms, one can assert their own identity and values while still engaging with others in a respectful and assertive manner.