Making sure it’s understood is sometime not enough

2 Days ago we went for Lunch at Central Chitlom. Then after lunch, a traditional starbuck.
Here’s what happened:
ME: “A coffee of the day, tall size, take away”
Waiter: “Small?”
Me: “Tall.”
Waiter: *typing on the machine* “Small?”
Me: “Tall.”
Waiter: *Fetching a coffee cup and showing me a small cup* “Small?”
Me: *Killer look that says: Are you kidding me?*
Waiter: [...]