While I agree with your observations, there is also some element of selection bias. Most Chinese students that are able to make it to the US come from rich families since most internationals don't get financial aid (so maybe they're more likely to be spoiled/entitled).

Also, depending on how "top" your university, it may have been easier for these students to get into your university than the top universities in China (e.g. they have lower test scores than their peers at the top unis in China).