Aside from things like animal abuse, I have a few specific ones.
Automotive lights. Use them properly. Adjust your headlights so they don't blind oncoming traffic, turn signals, etc. PLEASE, it's dangerous, inconsiderate, and illegal. Most people seem to not even know that headlights need to / can be adjusted. Also people who put HID lights in incandescent light housings, that is the worst of all.
People who ALWAYS make me late when I am helping them out. An example is I helped a friend out moving to a new apartment. He made me wait outside his place with the trailer for half hour when he had told me the day before I needed to be there on time. I had also called him as I left.
There are a few more, but those are the big ones. Mainly they bother me because I need to deal with them on a daily basis.