If your mother is anything like my mother was, then Xi Jinping is your mother:
The Chinese Communist Party wants you to clean your plate, and it’s not afraid to barge into the dining room and take matters into official hands if you don’t.
Yes, clean your plate is a thing, and as Adam Minter points out, a thing which connects quite well with public concern over official corruption. It's also part of the general crackdown on extravagant official dining that has been sending a wave of panic through five star hotels across China. And remember that thing where if you left something on your plate at dinner, it would be there staring up at you when you went back for tea? Try this:
I’ve attended dinners and banquets at which hundreds of dollars of food remained untouched on Lazy Susans. In one memorable case, I remember a large table on which three live lobsters, served as sashimi with their guts open to the room, were left uneaten, their eye buds twitching as guests (including me, with a glance back) left.