Vacation should be fun right??

I'm heading to Seoul this weekend to meet up with Cyndi, a friend from home who is currently visiting other friends living in Hong Kong. I'm soooooo excited to get away from the regular weekend happenings of Gimhae and have a breath of fresh air (not literally, but socially:) Anyway, I'm allowed 10 vacation days ~ 5 are fixed, 5 I can choose. Well, I've chosen this coming Monday as my first vacation day and it is turning into a huge fiasco. First off, I put in my request at least a month in advance as per my contract and yesterday as was busy preparing for my Monday classes my Director asked me why I looked so rushed. I reminded him that I wouldn't be in on Monday and he looked at me like I had just started speaking in ancient Greek. He then began to sigh heavily as if this was a major problem and told me I was a bad teacher. He then proceeded to chuckle. I however, did not find this funny at all and retaliated with calling him a bad director, followed by my own (very sarcastic) chuckle. I understand that I need to have my classes prepared for whoever fills in and I've completed this task to a tee including all the necessary handouts and step by step instructions for each class. For some reason, he then found it necessary to call me into his office and say, "Kimberly, the best thing would be for the teachers to teach, the 2nd best thing would be for tests". This was my turn to look at him as if he had just spoke in ancient Greek because I had (and still have) no idea what on earth he was talking about. For starters, the sentence doesn't even make sense! Basically I said, "look, I don't understand what you're trying to say, if you need to say something, please ask one of the Korean teachers to translate it for me, I've provided all my lesson plans for Monday and I'm not sure what else you really need from me". Maybe it was a bit harsh, but a vacation day is a vacation day right??!! I shouldn't feel guilty about taking 1 DAY OFF!! The academy should still be able to function perfectly without 1 teacher. HE SHOULD BE PREPARED FOR TIMES WHEN TEACHERS NEED A BREAK OR A SICK DAY RIGHT???? (siiigh).

I just don't understand why one day off has to be such an issue, especially if it's written in my contract...I told him I should have taken 2 days off...but I didn't, that would have just been snarky.