1) People who assume or expect you to do something for them (this obv. has varying circustances, but generally people who think the world owes them a living and have no intention of getting off their behind and doing something for themselves, whether it be getting a job, making a meal, or painting a fence).
2) Picking up glasses round the top of the glass (who know where their stinky fingers have been)
3) People who are sat down on the bus and don't stand up to give their seat to a more deserving person when there are none left (seats, not people!)
.....and a couple more because they are related to the above ones:-
Laziness - everyone likes to kick back now and then, I appreciate that but don't use the excuse that you are "laid back" when you're just downright lazy
Lack of hygiene - I am not Kim or Aggie, but it takes second to wash your hands after you have been to the loo, minutes to whip round with a duster, or put a dirty spoon in the sink, put a used mug in the kitchen or wipe where you have dripped a bit when making tea!!! Grrrrrrr.