Costco review: Cashier yelling at elderly

Kona, Hawaii- Cashier Sara also works in Optical Department. Witnessed her yelling at a grandmother in wheelchair purchasing groceries with her 7 year old granddaughter. To see the embarrassment and heartache of that child for her grandmother is why I am writing this. We are in a tense situation right now.. there were NO signs indicating we had to stand behind the "blue line" taped with painters tape in the ground. As a mother of six working two jobs we all get tired.. that gives you no right to mistreat this lady. Especially at a time when we are embracing our elders. Shame on you. If you cannot handle the stress do not work as a cashier.