Lots of things, but one that has many specific forms is especially annoying. That's all the little things that really are little but require more attention to do than you might think and often repeat themselves even thousands of times during one's lifetime: brushing your teeth, doing the dishes, shaving, finding the right key, logging in to services that log you out periodically... It's all so easy but repetitive and possibly time-consuming as well! I hate it!

Also, people in general deserve a special mention with the little annoying and/or stupid things they do. Thanks a lot for blocking the hallway in the grocery store, good sir! It makes perfect sense to put the cart sideways right there in the center. And more seriously, it's even much lesser things that annoy me.

You know what fucking annoys me? I just spent two hours trying to figure out why Chrome Canary won't run properly using ad blockers. I did so much shit. What fixed it was installing regular Chrome, which I only uninstalled for Canary because there was an issue specific to regular Chrome a few months earlier. Ugh ... fuck this shit

People who haven't read James Joyce. I'd go so far to say that those who don't have a favourite Joyce are pieces of shit.

Also, people who don't appreciate jazz, wine, and novellas.

People who don't know that there is a "View Results" button now.

I hate the headlines and the weather...

Haha! Oh wow, this caught me if guard!

n*ggers

edit: jumping beat me to the punch

When people are unable to see demonstrable flaws in their arguments (this sometimes applies to myself as well).

This is complicated because it's so annoying when another person does it but so hard to notice when it's yourself doing it. I try to pay attention to it, but it can be very very hard when you're caught up in a discussion.

People who confuse it's and its, so about half the users of the website.