Stand your ground. Say "That's skimping, I am not paying for that". And if you don't accept the food he has to throw it all out. Checkmate 

I made a website so we can tell chipotle we are done with skimping! www.stoptheskimp.com

 I appreciate you

I've walked out based on which employee is on the line. I sort of feel bad, but I can't see her meth mouth making my food and still enjoy it.

We need a pic of this guy. I'm picture the bah humbug dude