Since when這個在對話中常常出現是什麼意思?

請看英英字典的解釋(第3個)>>http://www.ldoceonline.com/dictionary/since

解釋說 used in questions to show that you are very surprised or angry: 這是在表達生氣的語氣? (矛盾...)

例句>>Since when have you been interested in my feelings?

講這句話的 speaker 是在表達他的不滿嗎?
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