Its always women I find to do that. Have to have the pushchair sideways on in the aisle too, just to cause more annoyance.
The only thing that beats that is when you're queuing at a checkout, and unlike blokes, women dont have their purse out ready, let alone the money like we do. Take ages finding it as they seem to insist on finishing bagging all the products first wasting more time, and then for all that they end up paying on card when the total is below £8.
Why do women do that? Love paying on card for everything actually.