What do we say when we are disappointed in someone?

“This isn’t what I wanted.”
“Why don’t you work hard?”
“Why didn’t you work longer?”
“Couldn’t you be more diligent?”

Has it worked? Does it work?
I am sure, we all know the answer to it.

Let’s try a different approach.
“I trusted you. You’ve let me down!”

People always know they are wrong.
Pointing that out doesn’t make much of a difference.

But if you let them know how you never expected them to be wrong, they won’t be wrong anymore!