Imagine a US college student studying overseas commenting about the US failures in the Vietnam War or the Iraq War over nonexistent WMDs. Would other US students harass that individual, and if so, would they report the individual to US "authorities" to make sure a message was passed on to the individuals parents?
I get riled up about bad opinions, but I'm not going out of my way to make their lives miserable or report them to authorities. Fuck man, I've got shit to do of my own.
But things like that often happen in the US, like, for example, in the case of people who spoke against the invasion of Iraq. This can even escalate further, I will never forget the “freedom fries” or “Today Baghdad, tomorrow Paris!”
Again, maybe I'm wrong, but usually that level of zealotry requires a few years of career and relationship failure that's out of reach to the average student.
China is not a global power, it is a regional power.