Online coupons, can't you just take them?

We all go shopping, yes everyone does. For the frugal person and the budget wise college student, coupons rule our lives.

I needed to purchase some new foot insoles and I checked-up on Dr. Scholl's website for some options. I found a two dollar off coupon for the one I wanted, and I printed it out. I went to my local Walgreens, purchased the insole, and presented the coupon. The guy tried scanning the coupon, but it would not read the barcode. He refused the coupon, rats, I could have paid $14.

Some other places are really nasty about accepting online coupons. At Safeway, I used a couple of coupons for dinner rolls and some soup, and the guy says that they don't accept it. I told the guy that I've used similar coupons and had no problem with them. I was also curious if they had a "no online coupon" policy posted anywhere. Haven't seen one yet!

The only place I do it these days is Albertsons at their self check-out stands, where as long as the product is not free, they honestly don't care, as long as the barcode can be scanned.

What's so wrong with online coupons? Most of them are savings of less than 75 cents, and each one has some form of verification to keep away the scammers.

Places I go for coupons: http://www.couponbug.com, http://www.coupon.com and these have codes on them that can be checked online to see if it is legit.

Let's summarize my rants:
Online coupons are great
There are little bitches at checkout stands that hates you.
Go to Albertsons, because they don't bother you.