Sobeys/internet coupons

today at Sobeys they refused to take my FPC Olivieri pasta saying they don't take internet coupons over $2 and they don't give away things for free....has anyone else had this problem?????--I think the cashier was mistaken, I think Sobeys doesn't take printable coupons.....am I right???? she asked where I got it and I said on an internet site and she said oh we don't take those....I didn't feel like arguing.....
I used a pile of coupons today and the cashier was really flustered, and she forgot to put my 2 FPC Hidden valley through and I had to go back into the store to get my $ back(over$9!!!)---a day like this really makes couponning not so much fun--some cashiers are soooo nice and some make you feel like you are stealing something!!!!!