NC’d just in case 
DH and I popped into the only decent shop in our town this morning. I had asked him to pick up the bank card before we left and he said he would. We go into the shop, pick up what we need (6 items non food). Checkout and DH realises he’s forgotten the bank card. We didn’t bring phones or anything.
The man on the till (there are no self service tills) didn’t say anything but did look extremely put out/grumpy when we apologised for the inconvenience. He was silent and visibly annoyed and DH said ‘it was just an accident you know’. The man didn’t say anything, still looked annoyed, and DH said ‘so much for customer service’. When we started to walk away, he turned round and asked for the man’s name which he told him. Then DH walked away saying that he was a twat, loud enough for him to hear.
I was mortified. DH was annoyed that I was okay with ‘being treated poorly’ by someone for no good reason. The man was in his mid 60’s I’d say and working in what I assume is a sometimes physically challenging retail role and to be honest, his reaction didn’t bother me. I go into that shop about twice a week on average and now don’t want to go back. It’s not a big shop so if the man was working he’d definitely see me and most likely be on the till. AIBU to be annoyed by DH’s reaction?