In the different countries I lived in, there is a helper at the cashier of the supermarket to help you in the packing, and in delivering the groceries to your car, in return of a tip. In Toronto, there is no one to help you, except at Costco. They have someone to help putting the groceries in the trolley. In fact, they have lots of customers, so in this way, they make sure that the cashier is efficiently working.

Innocently, I wanted to tip the man. He totally refused " No No Mam". 
All the others customers looked at me in a weird way, i felt my face so red and wanted to runaway.


Next time you go to Costco, Do not leave any tip to anyone.


Just different cultural behavior.