As for things that piss me of:
When people don't ask me any questions in a conversation. I like to roll out questions like "how are you?" and "what are you up to?" pretty early on, but I never get them back in return. They're more than happy to waffle on about themselves until the cows come home, though.
Limited Edition items. This is blackmail of the highest order. I don't see why something like a Doctor Who Blu ray set has to be limited edition.
Hypocritical people specifically the ones that preach kindness but sadistically clap their hands when they successfully bully and humiliate someone off the internet.
Teenagers on bikes. Not all of them, but one of them tried to push my mother into a bush once. I've also been abused by people from the comfort of their bike seat. The temptation to say "get off your bike and say that to me" is always there. I'm not a violent person, I know that the "high and mighty" act will drop once they're at face height.
The lack of proper support for porn addicts. This issue needs to be highlighted properly rather than the usual shrug of the shoulders. Even a therapist I saw awkwardly tried to change the subject when I mentioned that my porn use was one of the things that was causing me distress.