It means that he is immature. Feeling bad after losing? Don't play futures if you can't afford it. A 3-year-old child, always jumping at home, did not listen to his family's advice, and finally jumped down, as if he had been wronged and cried. In other words, he originally wanted to make his own futures, but now he has lost money. It seems that it was your fault that made him suffer. I don't see any difference between him and a child.