This Reddit post generated 22303 comments at the time of posting this. Mine would be “not closing your mouth when you eat” but thats just me. Here are a few of the more popular ones:
People using their phones in the first row at concerts while people are performing, rude as heck
git push –force
Home Owners ASSociations. All of them.
Having conversations in doorways.
Stopping dead in the middle of a vein of foot traffic.
Stopping dead immediately after moving through a doorway or other portal.