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彼の冗談に

at his jokes

→ 彼
phrase Rare #33,365
at his jokes に marks the person or thing that causes a reaction, such as laughing at or becoming tired of something. 彼の冗談 can refer to one or more of his jokes depending on context.
JA: みんな彼の冗談に大笑いした。
EN: Everyone laughed loudly at his jokes.

彼の冗談にはもう飽き飽きしている。

I'm already fed up with his jokes.

クラスのもの皆が彼の冗談に笑った。

Everyone in the class laughed at his joke.

彼らは皆彼の冗談に笑った。

They all laughed at his joke.

彼の冗談に笑わずにいられなかった。

I couldn't help laughing at his joke.