It is a common tactic of GW's and criminals who own crappy training centres to call anybody who criticises them "frauds" or "bitter" or other things

And it is usually western males married to chinese women who are like this and work as DOSES or own and operate kindergartens and training centres. One horrible english guy I knew, actually told me pleasing the wealthy taiwanese parents of his students, is more important than the overall teaching....IE only caring about profit.