It's been quite a while so a lot of the specifics are lost to me. I think I really managed to piss off the main teacher (and head of the department) by asking too many questions she didn't like. She seemed really annoyed when we were learning to categorize types of art. We'd get into arguments (civil, never heated) and she just got frustrated and told me to study more "because I'm wrong" rather than actually explain it. Wasn't doing it in a "I'm so much smarter and better" way. I was trying to better understand the subject.
I also mentioned I didn't see how things like the recycled art project and the extreme emphasis on physical presentation (as in on paper) of things like web advertisement mattered for the field of design where most of the work isn't in print anymore. She was old and seemed the type to really refuse to see change happening so that probably pissed her off too.
I know she had to hate me though because she was actively sabotaging me. I'd see ass kissers walk in with really blatantly plagiarized work and get away with it. She'd give me shit for using images under creative commons and listing them in a bibliography. If I missed a day and asked what I missed she'd often give me the wrong dates for things like a test announcement or due date on a project. I'm not the only person this happened to. I talked to a few people with similar experiences. Never challenged it though due to a lack of balls at the time. If I did she'd know it was me or one of the few other people she didn't like. She's the head of the department, she could fucking ruin me even more. Even if I did bring it to the attention of the school it would be her word vs mine.
Might be a good thing I quit it though since if I was an employer and I saw someone got their degree where I came from it'd go on the bottom of the pile.
At the time I was naive enough to think it was practical since designers are needed unlike the sort of fine arts you might think of when I say "going for art". Designing websites, advertisements, layout, that sort of thing. I was alright at the sort of work I needed to do since it was a hobby I'd occasionally mess with, but not pro-level stuff.
Now I realize for a lot of fields you're better off pursing your interest independently.