Not suffer fools gladly
Definition 1 of 1
Pro Tip 1/3Formality Level
The phrase carries a formal tone, often used in professional or educational settings. 
In the board meeting, the CEO made it clear he does not suffer fools gladly.
Pro Tip 2/3Criticism Warning
Using this phrase can sound harsh; it may imply criticism of others' intelligence. 
She doesn't suffer fools gladly, which can sometimes offend her colleagues.
Pro Tip 3/3Emotional Tone
Expresses impatience or irritation, not just a lack of patience. 
He quickly lost his temper, clearly unable to suffer fools gladly.