That joke doesn’t work for me. Let’s change the subject.
When a joke is at your expense.
Chinese original
这个玩笑我不太接得住,我们换个话题。
Why it works
The complaint is placed on your own ability to catch the joke, which is gentler than accusing the other person. The request to change the subject then follows naturally.
Original source unverified; not attributed to a historical author.