A piece of bad meat in a broth will turn everything in the pot bad. The Sun Xu incident is gonna turn the batch of scholars around him feeling sour despite the scholarship and opportunities given to them for a good foreign education in a world class university in a world class country.
Sun Xu is unlikely to feel good about the experience. He has shown to be quite an ingrate to rubbish the people of a country over a few stares by a few rude oldies, probably the illiterate type. His close scholar friends would likely be rubbed the wrong way and feeling uncomfortable with the whole issue. And so would other scholars who empathize with his plight.
The broth and meat have to be thrown away, including the millions spent on the whole batch of scholars. One bad apple is enough to affect the whole basket of apples. What a waste of money.