Sorry sir we cant take 100 dollar bills anymore

Old ass guy at least 70 walks in to buy a couple pizzas he ordered. 25 bucks worth of pizza and he tries to pay with a hundred. We havent taken hundreds in almost a year because scammers hit us with a fake hundred. This boomer yelled "WELL YOU ACCEPTED A HUNDRED LAST TIME" at my 17 year old co worker. Why are they like this