Yeah, blocking the (too narrow) aisles and getting their nose out of joint if you ask them to move is exactly the behavior I was calling rude.
Oh I never ask them to move, I sideswipe em, flip around to come from the other side, or give up on the item completely. I don't talk a lot out in the world of retail, I can do dozens of transactions and spend hundreds of dollars and not say a word... other than the muttering when I'm in Wally (muttering like a nutter tends to get people out of your way).