I'm usually super chill and it's hard to irritate me. But a few things do manage to get under my skin, and they bother me a lot. From what I can think of right now... (I apologize in advance for excessive caps lock.)
When people call me on Skype, don't use headphones, and I can hear EVERY SINGLE NOISE COMING FROM THEIR COMPUTER. I always try my best to use headphones because built-in microphones tend to pick up a lot of noise from the computer. If my microphone picks up ANY noise from my speakers then everybody complains and whines and I end up just muting everything. If somebody else's microphone picks up everything I'm "being b*tchy" and they get mad at me (and they don't do anything about the noise level.)
When people are sick and are constantly sniffling. BLOW YOUR FREAKING NOSE. Oh my atheist god it's not that hard. I have a friend who's ALMOST ALWAYS sniffling on Skype and I keep telling him to BLOW HIS NOSE but he never does. My brother's gf knows when I'm chatting with said friend b/c she recognizes his sniffling. And, when you're using a headset with a mic that sits right next to your mouth... IT'S REALLY LOUD WHEN YOU SNIFFLE. When I'm sickly I just don't voice chat on Skype out of consideration- try having some yourself.
When people who are depressed ask for help/advice and then completely shut down all my ideas without consideration and then continue to act like it's the end of the world for them. I'm taking time out of my night to politely listen to your problems and tell you it's okay and provide you with advice/helpful tips for combating your emotions, how about you actually TRY IT instead of constantly talking about how much life sucks and acting like I'm not saying anything? Which leads to another one of my pet peeves...
When people interrupt me. There are no words to express how much this pisses me off. If you ask me a question... let me freaking finish what I'm saying. Don't talk over me--have some freaking common courtesy to STAY QUIET WHEN I'M TALKING. I shouldn't have to repeat myself EIGHT TIMES because everybody's interrupting/talking over me. Halloween of 2011--People start talking to me and then TURN AROUND, WALK AWAY, AND START TALKING TO SOMEBODY ELSE in the middle of my response. WHY START A CONVERSATION WITH ME WHEN YOU AREN'T GOING TO LISTEN TO WHAT I HAVE TO SAY? I had to restart my sentences at least five times each, but got to the point where I thought "f*** it" and stopped talking. And (go figure) as soon as I'm done repeating myself they're SUDDENLY SUPER INTERESTED IN WHAT I HAVE TO SAY and get pissed at me because I won't tell them what I was trying to say for the LAST FOUR MINUTES. *grumble grumble*
When I can hear people eating. Like.. hooooooly friggin' ballsacks. It frustrates me the most. Chew with your MOUTH. CLOSED. Don't SMACK YOUR LIPS between chews. If you're on a Skype call with me (AND YOU KNOW THAT BEING ABLE TO HEAR YOU EAT BUGS THE SH*T OUT OF ME) don't start eating. If you really HAVE to eat while on the call don't say "I'm sorry if my eating is bothersome". JUST FREAKING MUTE YOURSELF. IT'S NOT THAT HARD. You don't ever hear ME reaching my hand inside potato chip bags, crunching on the chips loudly with your mouth gaping, constantly scraping my fork/spoon against silverware, and slurping my drink. DON'T. DO. IT. TO. ME.
In short I suppose I could just say "people who have no consideration for others" but I like ranting.