The phrase "cottoning to" means to become fond of, like, or approve of someone or something. Antonyms for this phrase could include words such as reject, dislike, or disapprove. Other possible antonyms might include loathe, abhor, disdain, or detest. These words describe a sense of strong disapproval or dislike for someone or something. Although "cottoning to" can have positive connotations, these antonyms suggest a somewhat negative attitude. In many cases, these words may indicate a sense of aversion or avoidance rather than a specific active dislike, but all generally suggest a lack of connection or positive feelings towards the object of the word.