I love this thread 
-Cyclists on pavements without cycle lanes on. I loudly tell them 'the pavements are for PEOPLE, you should be in the road'. They look at me blankly. I've never been hit by a bike or anything so this is really pedantic but I just worry for little old ladies or kids who might not move out of the way in time the way I can.
-People in shops who stand right behind you, or as close to the side of you, as they can get because they want to look at the same thing you are. Just...ffs. Don't bully me out of the way. Wait your turn like the rest of us, I'll be done in a minute. When I was pregnant and looking at something in Sainsbury's a woman actually PUSHED my bump out of the way as she clearly felt I was taking too long. I yelled at her; she too looked at me blankly.
-Bad drivers/parkers.
-Loud chewers. Please chew with your mouth shut. I don't want to see your personal cement mixer churning round and round with your lunch.
-People who post vague, cryptic Facebook statuses like 'SO PISSED OFF RIGHT NOW' or 'EVERYONE LETS YOU DOWN!!!' and then when you ask what's wrong they say 'oh nothing' or 'I'll PM you'. OMG fgkmgkgiei5ONDF BLOODY POST WHAT'S WRONG OR DON'T POST AT ALL!
-Lateness. In any form. Unless there is a valid reason. Hate waiting around for things.
-People leaving doors, drawers, windows, the fridge, cupboards etc open. Again another aesthetic pedantic one but if I have to trip over DH's sock drawer in our chest of drawers once more, thus stubbing my toe or bashing my shins, I'm going to empty the lot into the bin!
-Random strangers touching my child without my permission when he's in his buggy/baby carrier/we're holding him. It makes me want to ask them, 'do you reach out and touch all men you walk past, or just the small defenceless ones?' but I fear this is just PFB-syndrome 
Still, idk where their hands have been, and besides, my son likes his space and gets shy with new people so it must be overwhelming when a strange hand cups his face- and one old dear even went to give him a KISS in the DR'S where presumably she was ill with something. Just go away haha
-When I tell someone I want to lose a bit of weight, get healthy, take some exercise etc, and they say 'don't be so stupid, you don't need to lose anything, you're fine as you are!!' (I am not really very slim either so this makes me think it's a false/backhanded compliment.) For the record I used to exist solely on McDonald's and coffee until recently.
-Other people aside from my OH and I discussing our finances and telling us what we should/shouldn't be doing with them, especially since we do not borrow money from friends/family, and are financially responsible. MIL's favourite subject is our finances and how much money we spend on things. She is extremely generous and has gifted us large amounts in the past (gifts, that she insists are not to be paid back, and accepted by my DH without my agreement because of how uncomfortable it makes me) but thinks that this means she can delve into our salaries, outgoings etc. I am not happy discussing those things with anyone except OH, whereas he would probably happily divulge his pin number to his mother if she asked :/