Top 11 in Top 12 Code of Conduct on Vietnamese dining tables.
When you sit at the dinner table with everyone around you, you should watch and observe what food you should eat, and which pieces you have, and crash.
Not a shimmering food is not so abstinence for what is sacred, it is simply the expression of the courtesy of each individual when sitting together on the table. If you keep on shimmering the dish, the other person will feel uncomfortable.