What do you mean the truck isn’t done?

Today my manager came and said what do you mean the truck isn’t done? It’s only 1590 pieces and there are 3 of you and walked away in a huff. Why do they cut hours and fire people and want the same amount of work done when it can’t be done. But there are 5 in dairy and 7 in produce.and 4 store standards people working on a Tuesday. Store is going to shit again.