Am an older woman with a life threatening illness which prevents me wearing a mask. I wear a disability lanyard. Was aggressively accosted by young male employee on entering, who claimed I had to wear a mask, something my doctor has advised against. Barclays staff are not qualified to give medical advice. Govt guidelines state exemptions apply. On informing him I was exempt by way of disability, he became threatening and hostile. Spoke to me in shockingly disrespectful manner. "I won't help you so don't ask". Literally refused to serve me because of my disability. This is known as disability discrimination and is unlawful. Individuals are personally liable so I asked for his name and he said "I won't give it to you". Have made formal complaint. Remains to be seen whether Barclays will be smart enough to settle out of court. Disgusting conduct.