Dunnes Stores complaint: disrespectfuldisgraceful behaviour of staff member

my husband was treated absolutely disgraceful by a member of staff at the cash register bacause he wasn’t wearing a mask!! he told her nicely that he has trouble breathing and she asked him again and again on very arrogant and bad tone, very loud, making a scene, so all the costumers were watching!! He was actually thrown the bags the he asked for, very disrespectfuly !! this is unacceptable attitude by a member a staff who’s job is to behave nicely with costumers, to be helpful !! she has absolutely no authority to even ask or treat people like this!! he was nice and explained her anyway the reason why he didn’t have a mask, even though he didn’t have to. She should be made aware of the legislation and under no circumstances she can’t treat people like this!! my husband will never go there again, but I will go today and find out her name