What does "training" mean anyway?

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I'm doing my masters degree in Dubai, and I decided I would do an internship on the side. I've spent a month, and found that the internship doesn't add any value to my career path, and it's essentially one of those "we fire long term employees and hire interns to do their jobs at a (much) lower pay" My working week is from Sunday to Thursday, and last Thursday, I informed my manager that I wouldn't be willing to work after the end of this week, citing legitimate academic commitments that needed to be sorted out. He got mad and said that I treated this internship as a joke, and that their "valuable training" would be wasted on me. He even went as far as to say my work ethic was poor, even though I took care of most of the administrative tasks from the time I joined the company. Now my perspective and arguments that support my claim : - According to my contract, it is up to me or the company to terminate my internship at any time, as per the will of the terminating party. - My work involved googling data, putting them into Excel sheets, and interpreting those sheets into Word Document Reports. There is nothing unique about this type of work, since I've been using Microsoft Office and the internet since I have been a kid. We didn't even use different analytical tools or complex calculations. Just the basic stuff. - I come to work at the right time (9.30 am in the morning), yet I'd be alone in the office until 10.30am or 11 am. - On several days, only interns were present in the office - Most of the other permanent employees showed up only when a bank loan was required by the company, and the bank needed proof of a full fledged office. -Each time we asked members of the marketing team what they did, they gave us different answers that were really vague. -While taking printouts, I noticed most of the permanent employees and even the managers would be watching YouTube clips or a movie. Am I wrong to quit a place like this? Especially when the dissertation component of my Masters program is eating my head? I would like to know what part of my decision is based on an incorrect premise.