I hate retail extreme couponers!!! They really are the rudest type of customer

Is it just me? Or are you still sick of seeing customers turning up into stores with coupon after coupon after coupon, oh and some vouchers too?  I read an article back in 2012 that said retailers were getting smart and changing their policies in relation to how many of these barcoded beasts of burdon we could take, but nothing seems to have changed.  What’s even more frustrating is how rude and insensitive these people are to cashiers.  Not only do they confuse the hell out of them by telling them what to put through and when, they become aggressive and nasty towards the cashier if the coupons don’t work. I mean whose fault is it? Certainly not the pour soul who is paid minimum wage on the checkout. Heaven forbid that the complex money saving algorithm they spent most of the week concocting has a flaw. What purpose to these customers serve other than to increase queues and clear the shelves of  goods that can go to customers who need them? Do they really need 57 blocks of cheese that will go out of date before they can even eat them? They really are my biggest frustration at the minute.  Anyone agree?????????????