Mine is my mum. I do love her dearly but the one thing that irritates me is the half inch of tea left in a cup. I know her reasoning - back in the day, when tea was made from tea leaves, if you finished the drink, you would get a mouthful of groggy tea leaf sediment.
However, its 2016 and (as a non tea drinker) I would go on oath to state my tea has no grubby leaves at the bottom (I use a bag). Why it annoys me, I have no idea......but finish your bloody drink!
In my defense, I've never raised he subject, just walked away with the cup inwardly seething.
Any other stories of mid annoyances?