I don't think this is a "Chinese" issue per se. All my cousins and friends in China who have young ones definitely do not exhibit these traits. If anything, I see more of my friends and associates here in the U.S. exhibit such qualities.
I do think that due to the disparity, a stereotype like this must play very well into public sentiment. Bad food and air are an issue, and people with the means to minimize the risk do so, but I don't think there is anything odd in that.