People in the office with colds blowing their noses and not washing / sanitising their hands afterwards, then proceeding to touch the photocopier, kettle, cupboard and door handles, licking their fingers to separate their printouts from other people's etc.
People in the office asking if they can borrow my pencil, rubber, whatever. There is a stationery cupboard. Go and get your own!!
People in the office not having their hole puncher adjusted to A4 size, so papers get all ruffled up at the edges because they overlap the other pages in a file because the holes have been punched in the wrong place.
Dealing with a chronic illness (suffering in silence most of the time TBH), then having to listen to people in the office regaling everyone with their health issues, usually intimate details of their gynaecological woes, then feeling affronted that I won't tell them (apart from my manager, the only person who's business it is) why I have had a day off sick.
When people say "bare with me". NO. It's "BEAR with me".
Supermarket gripes;
A) checkout staff (of not even supervisory level) who have been given headsets and then proceed to chat amongst themselves while serving you
B) checkout staff that start to put your shopping through the till before the person in front has finished packing theirs away
C) the staff who do the picking for home deliveries/click and collect - they are always in the way with their trolleys