People who are falsely modest about academics (I'm talking about tests). Here's an example: Person A goes to take a test and before the test he says "man I didn't study AT ALL for this test." Then afterwards he says "omg that test was so hard." Then the grade comes in and he's got an A "WHAT! wow that's so crazy, I didn't even study." Or, it works another way, there are people who say every test is hard regardless, so if they do poorly they say "see, I knew that test was hard" or if they do well they say "man I'm so lucky to do well". Either way, it's a cop out, and it's bullshit (it's also annoying).
In general false modesty just annoys me, but especially with respect to school, it just seems like a big pile of bullshit. In high school, it was filled with kids not wanting to look like nerds, so they pretended and acted as if they never studied, even when they actually did, and then had "WTF" faces when they got A's... and in college I've found that it's more of the opposite, people usually study a lot, but then pretend like every test is insanely hard that way they don't feel stupid if they do poorly, and they feel relieved if they do well. It's a really annoying defense mechanism that most people have...
Here's my philosophy. In high school I was a pretty poor student (got bad grades), not because I'm dumb or anything, but I didn't give a shit about school and I was lazy as hell. Despite that, I almost never said tests were hard. I knew that I did poorly because I didn't prepare enough, rather than the material being difficult. One of the only tests I thought was legitimately hard was AP Computer Science, especially because I didn't learn jack shit in the class (and almost everyone failed the test). In college now, I have the same attitude, I haven't found a test that I thought was particularly difficult, and although I haven't aced all my tests, I always know what I'm getting right and what I'm getting wrong, and I usually know why. I don't lie to myself and say tests are hard and lower my expectations.
I prepare reasonably well for my tests now, although I'm never one to put in mega study hours, I always rely on the fact that I almost always go to classes and pay close attention, and then do the reading, and a bit of reviewing for exams, maybe a little extra for finals... but so far through every test I haven't felt the need to say "that was really hard". I personally believe that if you prepare yourself enough, no test should be HARD. If you think something is hard, you just didn't try hard enough, or there is something fundamentally wrong with your understanding (for example, if you learned some information wrongly, or didn't understand it well... but again, this can be fixed with better preparation).
I'm never one to bullshit people and say "oh I dunno if I did well on that test." If I think I'm going to do well, I'll tell people just that if anybody asks, and if I say I did poorly, it's because I legitimately did. Although sometimes tests are variable and someone may think they did well and end up not doing as well, I would usually attribute that to not enough preparation, and say something like "I thought I did pretty well, but I"m annoyed because I could have done better."
I'm not a perfectionist by any means, don't have a 4.0 or anything like that, and I'm not a cocky or arrogant, but I DO like to be realistic with myself for one, and to other people should they ask... because I personally believe that always lying to yourself and others in order to make yourself feel better is really stupid / annoying.
Anyways, I don't know if anybody else has this same annoyance, or I'm just weird. But ya. Try it sometime, just be realistic about your academics (if you have the problem I bitched about above)...