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の失礼な態度に

at someone’s rude behavior

→ の
phrase Rare #36,777
at someone’s rude behavior The person is identified before の; に marks the rude behavior as the target of a reaction or something someone puts up with.
JA: 彼の失礼な態度に腹が立った。
EN: I was angry at his rude behavior.

あいつの失礼な態度にはもう限界だよ。

I've had enough of his rude attitude.

私は彼の失礼な態度に我慢できなかった。

I couldn't put up with his rude attitude.

私たちはこれ以上彼らの失礼な態度に我慢できません。

We can’t put up with their rude behavior any longer.

彼の失礼な態度には腹が立つ。

His rude attitude makes me angry.

彼らの失礼な態度には腹が立つ。

Their rude attitude makes me angry.