English to French Art/Literary General / Conversation / Greetings / Letters Don't go giving it all large!

To explain, this is from a video.

This guy is in a coffee shop. One customer is ordering a 'grande' latte while speaking on his phone. He keeps saying to the waiter "give me a large coffee" and the waiter keeps explaining to him that there is no such large coffee, only 'slim', 'media' or 'grande'. There is this queue forming, and the main character, who is annoyed and in a hurry, asks the guy to say 'grande' and speed up. There's a bit of tension in the air. The waiter asks the guy to calm down.

This is when the customer who is still on the phone says: "Yeah calm down mate, don't go giving it all large, they don't do large in here."

So, I'd like to keep the pun with large/grande in French, and I've tried to find an equivalent with the word "grand".

For instance: Ouais, calme-toi mec, pas de grande gueule. Ils ne font pas de grand café ici". Mais je trouve pas ça terrible non plus.

Any suggestions?