I can't stand the Youtube ads. Nearly every fucking video I click in has some stupid ass advertisement for 15 to 30 seconds I have to sit through, and you CAN'T get rid of them. If you refresh, you have to do it all over again. Sometimes you can skip them after 5 seconds, but even having to do that is an annoyance.
I also hate what people use Youtube for. It pisses me off so much when I click on something like a Bruce Dickinson video, for example, to listen to some real fucking music by someone with genuine passion and talent, and then I see something stupid like a Rebecca Black, Bieber or Gaga video that gets millions upon millions of more views in an hour than this video has gotten in the 3 or 4 fucking years it's been up combined. For shame. The music industry has been castrated, and it doesn't even matter that most people generally go to a Bieber or Black video just to shit all over it, it's still unwarranted exposure.
God, what else? So many things piss me off. There's so many fucking meme's on the Internet that aren't funny that people just persist on using. That Lights/Gary Oak fad on WF made me want to strangle people through my screen. Occassionally there's one that's funny every now and then but god is it ever rare. The Rickroll is one that I actually do find funny, and thank God because it's probably the most popular one ever.