Well, I hate a lot of things, but let me try to narrow it down to just the most important few:
*When people let their nasty, smelly dogs come up and lick you in the face after you specifically tell them to get the dog away from you;
*Messy one-year-olds that drool everywhere. I know what you're thinking. . . "All babies are messy!", but this is not true. Some are really bad and just slobber and drool like they've got no muscle control in their face or something, and it makes me nauseas. (Also, I agree with hooah. . . . That kind of goes along with this.);
*People whose houses aren't clean and organized;
*Lazy people/procrastinators; and
*Incorrect grammar.
No, I'm really not as uptight as this makes me seem, but those few things really do irritate me.