Watching idiots slowly pass a lowboy hauling a tractor that overhangs the trailer by a foot plus on each side when they're coming up on a windy patch in the road. I wanna see that road grader blade sticking through the passenger side window of the yahoo's car, but I bet the truck driver doesn't.
Also, political "debates" on the interwebz that are just people trash talking each other. I doubt anyone's mind has ever been changed by an internet political debate. If I talk politics (which is rarely) I want the person I'm talking to to know I'm not a nut/nuts and therefore there might be validity to what I'm saying. Plus, people are less likely to seriously insult you and make death threats if you're standing 2 feet away from them.
Hearing people lump everyone who's (fill in the blank) into the "they're (fill in the blank)'s" cubbyhole. I judge each person by my experiences with them, no matter their race, gender, political leaning, etc and I wish everybody did the same. I'll take other people's opinion(s) of someone into consideration, but I draw my own conclusions based on whether I like/get along with them, not based on who or what they voted for or against.
Lastly, people going on and on about very trivial crap, or launching into a ten-minute to hour+ long (no I'm not kidding) lecture about why they hate something every time a remotely similar subject is brought up. Yes, I know Cali sucks for those reasons from my own experiences as well as the previous twenty times you told me them, I don't need to hear them again!
Oh yeah, also power line guys topping the same damn tree for ten years so it's just a huge bush but not actually dropping it and getting rid of the problem. Or, when they top a tree so the trunk stub is 1.5 inches inches away from the line, but it's technically "not touching" the power line.