Unprofessionalism, is it a big factor for a good working relationship?

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I am currently a part time teacher at an English School for Koreans. I just started last week as I was just also hired last week. Of course, being a new teacher i the school, I have to make sure to be as friendly as possible to avoid conflicts and develop good working relations with other teachers. There's no problem to that because some of the teachers who have been there for quite sometime are also friendly. But what I was so upset and disappointed about was this one encounter I had with one of the administration officer (I think the head of the Accounting). I went to the office because I asked for a whiteboard marker because the whiteboard marker they gave me the day before got lost in my own cubicle in the teacher's office and I didn't know who took it. So when I was already at the office, I asked the person in charge if I can ask for aother marker. Then, she asked the head of the accounting if she can give me another one. Know what the head of the accounting told me, she told me this in a very unprofessional manner, "Next time, you better take care of you things and not lose them because we are not a factory of whiteboard markers here!". I fell silent. I didn't know what to say. Is it my fault that somebody got my marker in my room without asking permission? all the other teachers also leave their markers in their own cubicle. I mean, she could have been professional enough to say it in a professional manner right? Does she have to treat me like that just because I'm a new teacher? what do you guys think?