Quite a few:
-the complete SHIT that is music today. Pop, hip-hop, rap and Disney (they get their own category) are just machine manufactured garbage these days.
-clothing from Abercrombie and Fitch or whatever the hell the popular one is now. Btw, if you don't have this clothing, you are considered an outcast from society.
-If you don't currently have a partner or are at least having casual sex, you must be a nerd that is shut off from rest of the world. Heaven forbid relationships should MEAN something.
-Gigantic earrings that some girls wear. They're friggin' hula hoops!
-Halo = gay.
-The tidal wave of reality shows that have engulfed my TV. They get worse by the day.
-Japanophiles. You can have your anime, manga, etc. just...but there's a limit.
-The average FPS. Developers just Xerox the next guy, give it a new box and move on.
-The attention-seekers: emos, goths, preps, ballers, etc.
-Sports are the one true purpose to life.
-Those girls that can not stop texting, and get told over and over to stop. Makes me want to...rip their phone in half.
-The word "sexy" to describe electronics and other products. They do not have sex appeal, morons.
-"The cake is a lie", "This is Sparta", etc. etc.
-Words that are overused so much they've lost all meaning. Ex. "epic", "win", "fail", "random", "noob", "pwn", "*every obscenity ever conceieved*"...
-trolls
-Jonas Brothers, Hannah Montana
-the word "******"
-console wars, PC elitists
-TWILIGHT. FOR GOD'S SAKE, TWILIGHT!
-The theory commonly held by females that states: Jock + Asshole = Potential soulmate. Then they get hurt, pick themseleves up, and get hurt again. Repeat.
-racism
-"Musical sex": My term to describe music these days. With descriptions so accurate I feel like I'm watching porn. Music is as ARTFORM, people!
-people using chatspeak/L33Tspeak in real life. Scratch that, people using it at all.
-repl4cing l3tt3rs with numb3rs
Oh God that's a long post. I just scratched the surface, though.