Nobody is "jealous" of your Stolen technology.
Chinese are stealing aviation tech from United States for the past 2 decades.
After stealing trade secrets from US and Europe, Chinese companies unapologetically tagged its products as indigenous tech.
The C919 is a massive failure for Comac China and the program has only continued due to the necessity of public image. The original design goals were not met.
C919 is already outdated and too heavy.