It is shamed in China. Chinese social media is quite livid towards their countrymen for not jumping in first. Bystanders who don't assist are found everywhere and are shamed everywhere.
Perhaps I was not clear enough about my point. First, bystander effect is NOT just a Chinese thing, and it doesn't happen just because of elements of Chinese culture or society or whatever. This sort of behavior is inherent to most people around the world. There are exception on an individual basis, but then there are exceptional individuals in China too. Now, if there was solid statistical proof that this phenomenon is more common in China than elsewhere, then that could be an interesting topic, but this sort of data is extremely hard to collect and verify. So until that happens, no, it's NOT a 'Chinese' bystander effect. It's just the bystander effect.
Second, shaming people for being passive bystanders is NOT just a western thing, they're shamed everywhere it happens, including in China. Plenty of Chinese people were absolutely furious about those who didn't try to jump in and help the woman. Of course, it's easy to complain about these things happening when you're detached from the event, behind a screen. Most people when actually placed in a situation like this won't be motivated to help.
Perhaps I confused you because I said I don't blame the people in this situation who didn't jump in the river, and you assumed that I meant that the Chinese people don't blame those people. Those were my personal views, and I was not saying that was the viewpoint of most Chinese people. I don't get mad about this sort of thing happening because it is so, so frequent around the world. Those who break free of the mold should rightly be praised as heroes. But I see no point in shaming those who don't, since that group contains most people on the planet.
Hope this clears things up.