Just back from doing my weekly shop. Shop was busy and not enough checkouts open so assistant packing shelves was asked to go on till. with a loud tut she flounced on, openly annoyed and started firing my shopping along the belt. Due to her speed she was finished before I had time to pack them all and proceeded to sigh and leave me to get on with it. My son has a part-time job in the shop so I felt awkward about speaking up about her behaviour. Now I just feel like shit because I let her off with it. AIBU to be annoyed with myself now for being such a wimp?