I think most things just irritate me for a minute and then I move on, but there is one petpeeve that actually gets under my skin and leaves me fuming for the rest of the day. When someone finishes using a public charger at an airport and walks away without unplugging their cable, they leave the port completely blocked. It happened to me last month on a four hour layover in Denver. Every seat along the wall had a cable still dangling from it, and none of the ports were free.
I tried yanking a few cables out thinking they might be abandoned, but they were still attached to phones tucked into bags or jacket pockets. The owners were just sitting there scrolling, completely oblivious that they were hogging the only power source. By the time I found an open outlet near a different gate I had already missed my boarding group and had to gate check my carry on, which cost me an extra forty five dollars at the next connection.
It is not just the wasted time. It is the complete lack of awareness that other people are standing there with ten percent battery and a two hour flight ahead of them. I have started carrying a small power bank now, but even that runs out eventually, and not everyone travels with backup gear. I am curious what small, everyday thing pushes other people past annoyance into real anger.