From the most annoying to least annoying for every category, the things I hate and consider as annoying are:
PEOPLE WHO KEEP SUBMITTING IPS PATCHES TO THE PATCHES SECTION
Excuse the profanity: Fucking persistent spammers and rereggers (guesswho)
Smartasses and rulebreakers
People who ask me really excessive questions through PM.
Internet in general:
Registering at some place to view a page you've been looking for.
EXTREMELY optimistic people.
People trying to act "cool".
People using internet memes in real life at the wrong moment.
. I could post stuff now and then
My Assembly for the SNES
tutorial (it's actually finished now!)