Apples and grapes, £2.90 each or 2 for £4.
The grapes had a yellow sticker having been reduced to £2.05 as sell by date was today.
Got to the checkout and it came to £4.95. I queried this and pointed out that had the grapes been full price I would have got both items for £4.
Checkout person got quite aggressive and said it wasn’t possible to get them as a deal. So I said ok, and walked away. He continued to practically shout after me “it’s not possible!” 
AIBU to think this is a ridiculous policy?