The worst shopping ever is going to Ikea on the weekend. There is only one Ikea in my city, and BE PREPARED if you decide to go on Saturday or Sunday. Be ready to squeeze by hoards of slow-moving families pushing oversized carts down the aisles as they gawk at the ivar and the guunk... I was recently there during one of these mad hours and while my significant other and I were examining some shelving, an oblivious mother with screaming hellspawn in arm came up beside me looking at the same unit. I gave my BF a burning "I can't stand this" look as this lady's baby screamed bloody murder in my right ear. The packed aisles did not make our escape easy.
And while I am a girl, clothes shopping is very annoying. Shoe shopping is even worse (which explains why I only have one pair of shoes at any time). I can feel the burning gaze of the salespeople while I try to browse, and just about every time a peppy salesgirl comes up to me and giggles "can I help you find anything?" I really want to smack them. I don't, though... I just smile and give them the usual "no, i'm just looking right now, thanks". And when cashiers try to make that fakey small-talk with you... it always makes me so incredibly uncomfortable... does it make most people happy or comfortable, and that's why they do it??
I don't mind shopping for art supplies, or comic books (usually), or videogames, or groceries... any time salespeople decide to leave me alone and let me look for myself...