Car drivers who think they own the road and think I should ride my bike in the gutter (not aimed at anyone on here of course ). They should read roadcraft and learn to drive properly. 3 up on bikes is excessive, but sometimes they have reason (ie if its unsafe for cars to be passing).
In my car not a lot annoys me, I just cruise along, if someone wants to go slow theres plenty of places to overtake them, if someone wants to drive like a tit, I just back off. Theres so many bad drivers these days that being alert and relaxed and not trying to rush anywhere is the only way to stay alive