Wow, where to start? The people who block aisles at the grocery store is a big one for me. I also seem to run into the worst offenders every single time I'm at the store.
People who do 40 MPH when trying to merge onto the highway.
My one coworker who calls in sick all the time. I get the people get sick and sometimes you have to call in, but this guy does it all the time. He also sounds as though he's on death's door whenever he calls in. "Um, Bob, you just said you had a bad cold and a 99-degree fever. I don't need the 'sick voice.'"
Robocalls.
Poor communications. Just in the last two months I've missed out on at least half a dozen events with my kids, and my kids have missed out on just as many things, because the people in charge didn't communicate them out, or didn't do so effectively. Don't send me an angry email after the fact saying that you had to cancel an event due to low participation when you never sent out the initial email saying that the event had been scheduled!
People who run red lights.
People who can't do their own job. I have a manager/team lead who is constantly sending out emails asking us to do really simple things for him, like calling or emailing someone else for him. He gets upset with me over his email requests because I just forward his emails to the intended target.
People who get spruced up to come to the gym, especially first thing in the morning. Why on earth would you wake up an extra 30-60 minutes early to shower, do your hair, do your makeup, etc. just to come to the gym and get all sweaty?
Bullies. I could go on for pages about them.
Gossips. Ditto.
Stores that put an item on sale, then put out just a few each morning and never restock.
People who tell you they know more about a topic than you do, when you're very knowledgeable and/or an expert and they clearly don't know anything about it.
I have plenty more...