Question: Here's the scenario: I screwed something and that caused some real harm. Now another person could just tell me, “Dude, you screwed X and this caused this and this harm," but instead he will try to be supe- diplomatic and vague to “not hurt my feelings.”

I’d like to tell him, “Dude, stop that diplomacy and prettification — I can take the ugly truth, whatever it is.”

Is there a widely recognized idiom for conveying that message?

Answer: 
Consider:

> 
> Just give me the unvarnished truth, please.
> 
> 
> 

(This is admittedly used more in written communication.)
Also, you could deny being *thin-skinned* (or assert that you are *thick-skinned*).