Imagine that you are working in a coffee shop and you are putting the regular coffee shots for your customer, and suddenly the boss tells you to reduce these coffee shots without telling you why.
Your customer will get disappointed, what would you tell your boss?
Will you just follow what the boss says?

It's none of your business, just do as you're told.

If you get complaints from the customers, you should forward them to your boss. And don't tell the customers that your "stupid boss" ordered you to serve them weak coffee. It's none of your business.