Got in trouble for teaching Taishan

I was trying to provide the best customer service ever, but my manager got me in trouble and not to teach Taishanese again. In my response to it I got to look for a different job. I have no interest in my own language, its rare language that you'll not going to use it anywhere else anyway. Taishanese people also treated this language as a secret weapon, my family treated it as a secret code, they don't allow me to teach it to someone else. My family tell me that teaching someone to speak Taishan is wrong act. it sucks to be 2nd generation immigrant.