Living in a country which is radically different from my own, I have a few pet peeves, but to list them all would probably give the wrong impression. I'll stick with the one insufferable habit which seems to be endemic in my city; completely ignoring a queue.
The number of times I've wanted to punch somebody in the face who has quite literaly pushed me out of the way in order to be served their potato chips (or whatever) first or reached over my shoulder and shoved a note into the salesperson's face and barked "Ge wo ......." [give me ......] is beyond count. Older people are the worst and they often totally ignore you, even if you are talking at them in their own language from two feet away. I used to just grind my teeth but now I tell people to back off, sometimes even having to push them out of the way. Or there is the "subtle sidling in" which means you need to do a silly little dance to let them know you're aware of them. A colleague was just about to be rung up at the supermarket once when an old lady shoved his stuff back and put her own stuff onto the scanner then demanded he give her some room- she had just skipped past 10 people. He took her stuff and threw it away, much to the delight of those waiting. When getting on a bus I'll let kids and women with kids past me to get onto the bus- this inevitably means some man will try to rush the door, necessitating a full-on body block at times.