How to say something is "an acquired taste" in Chinese?
The English expression acquired taste refers to the nature of the taste being perhaps unpleasant on first taste, while one becomes habituated to like it through exposure, hence the acquiring. I would prefer a rendition such as:

可能需要慢慢地适应。
要慢慢来才会欣赏。

An idiom can be appropriate as a pithy reply:

一回生，二回熟。