Men don't enjoy shopping like women do.
Shopping, for men, is like going to the dentist. I don't enjoy going to the dentist either, but I will go do it when I need to. But why on earth would I want to go along with someone else when they go to the dentist? Sure, if you will need some pain killers and thus need someone to drive you home, I'll take you, but I'll be waiting in the waiting room - I don't want to go into the exam room with you. If you really need me to go in with you and hold your hand, I'll do it, but I won't enjoy the experience.
See, for you shopping is about trying things on for size. See if it fits. See if it looks good on you. There is pleasure in the journey - in the hunt. For him, shopping is about fulfilling a need. The first one you find that meets that need, you go buy, and you're done.
Say you are a primitive man and you need some food. You go out hunting. You come across a deer. You don't say to yourself, "Hmm, do I like the color of that deer? Is it tall enough? Do those antlers make my butt look big?" No. You throw your spear, you drag the carcass home, and you call it lunch. Now say you are gathering fruit. You go along looking at all the colors. You say to youself, "is this fruit ripe?". You might spot some that you're not so sure about, and you'll come back to it if you don't find anything better. But you keep shopping ... ur, uh, I mean "gathering". This is why in hunter/gatherer societies, men do the hunting and women do the gathering. It maximizes both of our skill sets. You take men, who have for years been breed to be the hunters and you make them go gather and you wonder why they aren't good at it.
Honestly, he must love you an awful lot to go shopping with you at all, even if he does hate it. Frankly the feedback you get from him probably isn't too useful to you anyway, so just go shopping with your girl friends, while he goes and does something with the guys, and afterwards you can get together with him and show him what you bought, and he can tell you about what he and his friends did. You'll both be much happier.
If he were good at shopping, then that would be a red flag that maybe he's gay...
"Defending the Caveman" - a great one man show that goes into why men and women are different. The author goes into the hunter / gatherer analogy. Great show. You'll both laugh.