The professors and TAs that are condescending or otherwise just assume people know as much about the material as they do. I thankfully only had this happen a couple times, but seriously…we’re here to learn, if we already knew this stuff we wouldn’t be in the class!
People who hog class time. If you happen to have a lot of good questions with maybe an occasional trivial question in there, I don’t mind and if anything appreciate you. But if you’re asking a bunch of trivial questions and interrupting the professor to do it, you’re annoying. This also applies to people who keep making unnecessary comments that distract the class. I don’t mind an occasional small distraction, but seriously don’t start doing it every class or making a big scene.
People not taking initiative or not taking academics seriously. I didn’t care about this unless it actually affected me though. If you want to stay in your room all day sleeping and watching Netflix but aren’t bothering people who are focusing on school, fine. But once you start bothering the people who are focusing on school and making it obvious that you don’t care in the meantime, I’m annoyed.
Case in point: One of my freshman year roommates was only there because her parents made her go to college. She didn’t take her academics seriously at all, while me and my other roommate very much did. She’d party just about every night, come in in the middle of the night on a weeknight at various levels of intoxication to turn the lights on and be loud with her friends, watch Netflix without headphones in the middle of the night while the rest of us were trying to sleep…and then she’d yell and literally stomp her feet at us for our class alarms waking her up, because “you should just skip like I do, school isn’t important anyway”. Yeah no, your bad decisions are entirely your own, not ours. The good news is those kinds of people don’t tend to last past their first year. Said roommate is a perfect example.