What annoys me...
Lack of proper english (waht r u talkin abuot?)
Video game culture (ZOMGZ LULZ, EPIC FAIL NOOB!) (Playing only video games all day)
4chan craziness
People paying for a cellphone over a car... (There are so many people who ride the bus or complain about not having a car and instead have a cellphone with unlimited texting and other bullshit)
People being overly obsessed with vampires... (I see more young people into this)
People trying to look/act different and just looking stupid... As you get older I think you start to stop caring.
The idea that has been implanted into their brains that your car, house, job, etc is who you are...
Credit Card hunger in the youth. I tend to see everyone use credit cards to buy EVERYTHING now. I don't think they all do it because they want the rewards points either...
Lack of financial knowledge. I like to think that previous generations had better knowledge of finances than the ones now. This is not 100% due to the childs fault though. This is due to the parents and the education system.
That's all I got in this short time.