It’s not just me. If I was literally the only other person in the store, sure, I could understand that, they thought they were alone, they weren’t expecting to encounter anyone else.
How the fuck do you just stop being aware of an entire seething mass of other humans flowing around you?
I’m serious, though. How do you make that “mistake”? How do you get so excited that you completely tunnel-vision out the simultaneous existence of hundreds of people? That’s absolutely in no way neurotypical.