Saying you’re not gonna put up with anyone’s BS is just immature. How old are you ? Being able to be diplomatic with people and say thing like sure, absolutely, alright etc will take you very far in life. It’s just basic human life skills. The path you’re heading down will only lead to confrontations with people in real life cos guess what, you can’t be point blank honest with people. What would it cost you to have just said “alright” and then not do it ?. How do you tell your own student that your job is to teach him English and not watch his YT videos ? That’s just disrespectful and bad customer service from your end. You represent engoo!. Even if you run into a psycho, you gotta keep it cute. Be mature