Who is being rude here?

本帖於 2021-11-15 17:45:30 時間, 由普通用戶 鈴蘭聽風 編輯
回答: Someone hands you a cup of water中間小謝2021-11-15 16:38:08

A offers her opinions to B. 
B comments A's opinions in an honest and polite way.
C criticizes B “偏狹而且無禮” blah blah ……

Question: Who is being rude here?
Correct answer: C 

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