Mine is people using are instead of our. I hear this all the time from social media, news reporters, and I see in in writing. Instead of our, they use are as if they forgot the word our exists.
People who park the wrong way in the parking lot and then dive the wrong way. I'm talking about were the lanes aren't wide, so they're all angled. There even arrows painted at the entrance of each lane. But there always some dipshit that pulls through, or did the dumbest maneuver you've seen to back into it. And then they glare at people in their way who are going the right way...
Going to the grocery store has just infuriated me with a sheer number of entitled terrible drivers. Every last one of them should be sent back to driver's ed.