Pop science faggots. Nothing wrong with having just a casual interest or whatever, but the kinds of people that post macros of "Like, omg, our universe is so big :O" and Neil deGrasse Tyson quotes all the time to foster an image of being intellectual without actually really trying to understand anything are useless. These types pop up in lecture a lot too; often they are outwardly nerdy and unattractive which I suppose they realize and therefore feel a need to adapt an intelligent persona, but they always fall flat on their smug faces. Like going to any basic physics/physical chemistry class, they're the kind that will ask the professor "Durrrr, don't you need to factor in relativity?" when discussing a baseball traveling at 30 m/s. Or go to an ochem lecture, and the only term they ever learned was "steric hindrance", which they will try to use to explain every fucking mechanism discussed. If there's a break in the middle of lab long enough to get a coffee, you can bet that they're the kind to wear their lab coats to Starbucks. Total fucking posers. These types will often debate creationists on internet forums because that's about all they can take on, and even then their form of debate is usually shallow on based on elementary school platitudes on par with "Knowledge is power!!!".
But I guess that applies to anyone that I see as pretentious without the know-how to justify it. If I were a music theorist or a student of history or anything else, I'm sure I would hate many of my falseposing peers just as much.