There's always gonna be Internet trolls and warriors that will make their nation look bad.Did I make it sound like that was the only reason? I was singling out a particular reason. So just because every other nation has internet warriors who make a fool of their countries does not mean China deserves a free pass. It also depends on the issue and how it is worded, etc. An Indian who makes a case for taking southern Tibet is different, more nutty, compared with a Chinese who makes a winning argument to take back Vladivostok, et al. I don't know if you agree or not.
It really isn't possible to not have them, and also not worth the resources to try and remove them (not to mention that would also produce negative news in western media).
Besides the above, western news can very much 'fake' such Internet warriors (paint, or even creating such a troll account themselves and posting on say weibo).