There are no mechanic you talk etiquette at all. Thai people to greet you. You speak like this, or this is not the Thai people's manners!. You don't answer, don't answer, they say, do not have this SIM.
You are so rude in speech. People greet you. You say that whether or not this is courtesy of the Thai people.? Don't you answer it, don't answer that don't come words like this.