Well, thinking back, what I experienced today is quite "mild". There's a female student, once cried in front of him, and yet he said, "no point crying, You can't trick me like this.". Got once he said, "let me open the window for you to jump down" and "you should burn yourself alive to death!" So what I got today wasn't really that big deal. BUT it is probably because of the fact that I talked to him in English, so he didn't have enough vocab to say this kind of things.