I came here as a College English Instructor from Thailand where I taught every grade from Primary through University. In Thailand, as soon as my students heard me speak Thai, "it was all over." That's all they wanted to speak. It is a very big challenge to get Chinese students to speak English with each other. Even higher level Chinese English teachers are NEVER heard speaking English to each other. I noticed the Speak Chinese sign above. That's good. It's called Immersion. I purposely did not bother to learn Chinese here forcing my students to speak ONLY English to me. Calling anyone an idiot is a bit strong. I communicate & get around very well. Being fluent is not the same as being able to communicate!