I can’t stand people who chew with their mouths open.
It drives me insane when I call up a company and I get Dial 1 for X, 2 for Y, 9 for Z” and so on. Or the common assurance Your call will be answered in the order it was received, and then you have to listen to that boring music while they put you on hole.
When people don’t give up their subway or bus seats to seniors or to those with disabilities.
People who stand in the way of others who want to use and escalator or doorway.
People who change the TV channel without asking when someone is clearly watching.
People who stand in someone else’s line of sight in font of the TV during the last 30 seconds of any show or game.
People who “borrow” stuff without asking and don’t give it back.
Guests who put their feet on your furniture.
Leaving a pile of dirty dishes in the kitchen for roommates to wash.