I nearly knocked a girl's backpack off a bridge a couple years ago. There's a small bridge on our uni campus with a 2 person wide walkway on each side, and there's a couple residences and lots of student housing on one side with main campus on the other. So many people (tbh, mainly asian students - definitely a culture thing according to my asian friends) walk on the left side (which is frustrating/annoying because the path narrows to ~1.5 people wide at each end of the bridge because of the stone pillars). Finally I'd had enough of moving aside to let people walking double file the wrong way go through. Stiffen up and hold my shoulder while keeping my right side brushing the railing, give no more space than what I can afford to give without contorting myself. So among the many groups of people that walked into my elbow along that bridge, there was a group of girls that this one belonged to. She made eye contact with me, looked away, kept walking in my path as others moved around her. I did not. She walked right into me so hard that her bag ricocheted off her back and the strap came loose, nearly going over the railing.

But in general, obliviousness annoys me. And oh god living in an asian city for a year... going to any sort of department store was a nightmare. Walking down the main aisle pushing a cart? Watch out for the little old lady that just stepped out in front of you without looking. Pushing a cart of lumber down the designated aisle? Watch out for the family that walks across right in front of you after making eye contact. I do my best to avoid making relations to race, but there is 100% a cultural component to it.