Mine are: tacky xmas lights on the front of houses and in gardens - where there has been clearly no thought into the overall presentation.
Secondly people who do food shopping in excesive numbers - i.e. its okay to have two people there when you doing a big shop but why 3 or 4 they just add to the congestion of a busy supermarket. I am refering to older childrena and adults - NOT young children who clearly can't be left alone at home.
and.... these people who stop in the middle of an exit to talk - move to one side (this annoys me all year not just at xmas).
I could possibly add tescos to this for selling me mince pies last nite that have a 'best before' date today - but then again ive used this as an excuse to stuff in two whilst typing this!