Shocking experience at Sainsbury's Streatham Common. As usual there was only 1 till open and staff were attempting to bully people into self service. The queue was winding all the way down the aisle Shoppers stood their ground, refusing to self serve since we don't have an employment contract with Sainsbury's and don't work for free. A 6ft Nigerian man tried to jump the queue. An elderly lady who was obviously a cancer patient (judging by her appearance) informed him there was a queue. Demonstrating low impulse control, he started verbally abusing her. I tried to intervene, to which he told me "f%ck you". It was incredibly intimidating. No security staff in sight and the other staff looked the other way. Sainsbury's clearly despises its customers. The behaviour witnessed was disgraceful. It was left to customers to comfort the lady who was shaken by the ordeal.