Sous chef cannot count

Time to vent boys, I work in a chef agency that staffs temp chefs around my city and on Monday I was sent to an events kitchen in a 5 star hotel. Place was dirty and disorganised but that's besides the point.

I had to assemble canapes for a banquet and send them down to the pass. The entire evening the sous and the head were berating me to work faster (they would tell me to make a dish, then 30 seconds later shout at me asking where the fuck is it when they know they have to be refreshed in the oven for 1 min to heat up).

At some point the sous asked me to make him 12 gyozas. I flash them in the fryer and bring em over. He looks at me and asks me if that's 12. I look down then at him and confirm yes. He starts to count them and tells me it's 11, we go back and fourth at this fucking tiny tray of gyozas until I try to invoke pattern recognition in his coke fried brain by arranging them in 4s to show it's 12. And for the first time ever in my life I shouted in a kitchen as I'm a relatively calm guy. He tells me to shut up and bring him one more.

I go back and bring him one more gyoza and by the time he already plated the 12 and looks at me with a dead stare saying he meant 13. He eats the 13th gyoza and sends away the plate of 12.

Angry regards, Temp chef.