Im not Chinese and as a teacher of Chinese martial arts; I have experienced racism at the hands of Chinese teachers more than once over the years as well as would-be students who disappeared after discovering that the instructor wasn't of their ethnicity. Sometimes it was just because they wanted someone who spoke their language and sometimes their French or English was better than mine so that couldn't have been an issue.
looking at your website you have a lot to offer, sounds like it may have been more of a language issue with the students, and a rice bowl issue with
the other instructors.
In china, they often joked about me, a laowai, teaching the chinese, a chinese art.
One time I brought some students to beijing, my teacher in his 80s at the time, smiled and thought it was pretty funny.