There is an interesting evolutionary answer to that question.
First of all, what men hate about shopping is spending lots of time choosing items to buy. Women usually either like it or don't find it so much annoying as men.
The reason for those two types of reactions is that women for many ages were gathering herbs and fruits, and men were hunting.
For a gatherer it is important to examine if fruit is ripe enough and not poisonous. You need to take your time :) Contrary, hunter has to react fast, or the beast will run away. So even if an iPod is not likely to run away from shelf, men still tend to make decisions to buy faster than women