China is not homogenous. Go to one town, and local authorities are in on the tourist scams. Go to another, and you get a shockingly (and I mean shockingly) different reaction to anyone who makes the place look bad to foreigners. This has also been known to happen in other countries. How people react when this sort of community relations problem comes up depends on how secure or threatened they feel.
If the anecdote about foreigners in Taiwan is true, there are two explanations:
1) they think the alleged perpetrator needs to learn about domestic harmony the hard way, and/or
2) they reckon he's making them all look so bad that the daily fruit pickers will whip up so much anti-foreigner hysteria that the government will take unfavorable action against the entire foreign community (or at least against English teachers or whatever they happen to be), and there go their carefully laid and nurtured plans, their hopes and dreams as immigrants.
Not all westerners in Taiwan (or elsewhere in Asia) would react the same way, nor would all Asians in the US (or wherever).
Do Asians in the West feel more secure and less threatened than vice-versa? They tend to be in a stronger position legally because of the different standards of human rights and the cultural differences about how foreigners are perceived, but anti-foreigner hysteria is by no means limited to non-western countries.