Humor doesn't dismiss a subject but rather often opens that subject up for discussion, especially when the subject is one that is not considered "fit" for public discussion.

幽默不拒绝讨论一个话题，而是经常放开这一话题进行讨论，尤其是在这一话题被认为是不“适合”公众讨论的时候。

Let's dismiss the subject and talk of something else.

我们不要再谈论这个题目了，谈点别的什么吧。