[omoikane]

A related concept in Chinese is 對號入座:

https://en.wiktionary.org/wiki/%E5%B0%8D%E8%99%9F%E5%85%A5%E...

An example might be some person A saying "only an idiot with this set of very specific negative attributes would do this thing". And then person B came out in the public saying they had been slandered by person A, thus indirectly admitting to having those very specific negative attirbutes.

Basically if person A invokes something like the small penis rule, it's often better for person B to stay quiet to avoid 對號入座.

[boho_derogatory]

That example doesn't express this at all. A better one would be saying "Jane and I partied all night," and Jane's murderer blurting out, "That's impossible!"