The phrase "coming out against" means to openly oppose or express disapproval towards something or someone. Antonyms for this phrase could include "supporting," "defending," "advocating for," "embracing," "endorsing," or "promoting." If someone is not coming out against something or someone, they may be described as being "neutral," "indifferent," or "uninvolved." It is important to consider the context and the severity of the issue at hand when choosing the appropriate antonym for "coming out against." In some cases, a person may choose to remain neutral, while in other situations, actively advocating for and promoting a cause may be necessary.