端起碗吃肉，放下筷子骂娘

duān qǐ wǎn chī ròu , fàng xià kuài zi mà niángduanqiwanchirou,fangxiakuaizimaniang

1. lit. to eat meat from one's bowl, then put down one's chopsticks and scold one's mother (idiom)
2. fig. to complain despite being privileged
3. to be ungrateful for what one has been given

Study it in Yanamino