Angry to be spoken to in Mandarin

I read the discussion about a Daniel Chua posting his encounter with a Chinese waiter at Harbour Front. He was unhappy to be taken for granted, that a waiter had the audacity to choose to speak to him in Mandarin. He snapped back at the waiter with the ‘Do I look like a Chinaman’ act. To add insults to injury, the waiter replied that he should be proud of China as his ancestor also came from