So sorry to read this, ArthurMann. I work part time at Tesco and would never tolerate a customer behaving like this. Fortunately it very rarely happens in our store, although on the one occasion someone started harassing an elderly customer on my checkout I told him to go to self service, as I was not going to serve him. I'm afraid the rest of the queue just stood there like sheep - perhaps afraid that the oik would get violent and hold things up even more. (he demanded the manager, luckily it was one with a bit of backbone and he was told to leave). It still left the poor woman shaking like a leaf. Last night, around 9.30pm, I had an 'elderly' (quite likely younger than myself!) customer who was very slow - as the transaction continued it became obvious he was having problems with processing the situation, and I ended up sorting out his clubcard and vouchers on his phone for him. All took some time and there was a guy in a business suit behind him who started on the huffing/puffing. I gave him a glare (apparently I give good Glare, even when I don't mean to) and then looked pointedly at his five items, and he shut up. Unfortunately it seems it's only us old bats who have the confidence to call customers into line, the younger ones just don't dare.