Students interviewed for this article deplored the more extreme expressions of anger, like death threats against the Duke freshman and the tossing of the water bottle, and pointed out that Chinese students had little experience in the art of protest. But, they said, they could also understand them.

“We’ve been smothered for too long time,” said Jasmine Dong, another graduate student who attended the U.S.C. lecture.

By that, Ms. Dong did not mean that Chinese students had been repressed or censored by their own government. She meant that the Western news media had not acknowledged the strides China had made or the voices of overseas Chinese. “We are still neglected or misunderstood as either brainwashed or manipulated by the government,” she said.

No matter what China does, these students say, it cannot win in the arena of world opinion. “When we have a billion people, you said we were destroying the planet./ When we tried limiting our numbers, you said it is human rights abuse,” reads a poem posted on the Internet by “a silent, silent Chinese” and cited by some students as an accurate expression of their feelings. “When we were poor, you thought we were dogs./ When we loan you cash, you blame us for your debts./ When we build our industries, you called us polluters./ When we sell you goods, you blame us for global warming.”

Rather than blend in to the prevailing campus ethos of free debate, the more strident Chinese students seem to replicate the authoritarian framework of their homeland, photographing demonstration participants and sometimes drowning out dissent.