Video game related:
Unrealistic real-life weapons (shotguns do not have a 200 kilometer spead for forgets sake)
Games that have an explosion blast radius equivalent to a peanut
Frustrating games (I like hard games but when it's simply frustrating I want to throw the game out the window)
Games where everything has an albedo akin to Enceladus regardless of what it is made of (eg everything made in the UDK engine)
Batstuff handicapped AI
Messages you here every five seconds
Bottomless pits, small platforms and the jump height of the Heavy
TF2 Pyros
Games with grind-related power-ups (COD airstrikes are an excellent example)
People related:
Wiggers
People that play loud rap music with their windows down and drive at a stunning 2 mph
People that believe science is an Evolution/Atheism-specific thing
Heavily-religious people (for clairification, Christianity is primarily your personal relationship with Jesus/God/Holy Spirit which is why I can sit back and laugh at religious people with atheists.)
People that just have to tell you about something (anime, manga, other japanese stuff, homestuck)
People that aren't enlightened about my snake.
Food related:
Foods that, when the nutritional facts are inspected, look more like edible chemicals than actual food
Nose-scorching soda burps that would be rude and loud if done via mouth
BLF related:
Lord Tony
People complaining about v21
Nick not updating CC
People not posting in Comrade's Adventures
Bronies that post things outside the MLP topic
People that post obviously inflammitory subjects to provoke fights
Internet related:
loving NETGEAR HHHHHNNNGGG (aka the reason I haven't been on for a week)
Hobby related:
Remixes that are too loud but when turned down sound like the original (aka the story of my Umbral Ultimatum "remix" per se)
Stepping on legos (though my gears grind harder if they break after stepping on them)
Confidence and ideas to make something, then opening up the program I'm going to work in and losing motivation in an instant (why I've never done anything of signifigance in Blockland)
I'm a very crabby guy when I'm honest.