As the question is asked in English and the questioning person has in her profile English and an other language as her used way to communicate I dig into the depth of School english to answer. 

First of all there are a lot of things you have considerate. Even the people of Vorarlberg ans Vienna aren't the same and the misunderstanding is common. Whenever you meet someone from abroad crook in mind he has another background and nothing you are used to it surely the same for him.