The phrase "not be someone's cup of tea" is often used to describe something that someone does not enjoy or is not to their liking. There are various synonyms for this phrase, including "not be someone's thing," "not be to someone's taste," "not be someone's favorite," and "not be someone's preference." All of these phrases convey the same message that something is not suitable for someone or that they simply do not like it. It is important to use such phrases sensitively and respectfully, as personal preferences can differ widely and should be respected.