"Booster"

We went to have our boosters done on Friday and we didn’t realise you still had to wear mask that was fine for me and my son but my husband can not wear one cause they cause him trouble breathing make him sick etc he had his 1st and second jabs fine no problem with him not wearing a mask but for the booster he was refused entry when it does say in the email I got which I reread after the event if you can wear a mask do and if age illness or disability makes if difficult to wear one you didn’t have too but I explained he couldn’t wear one but was refused entry even though the place was empty only the staff