Calling something picayune means it's trivial or of little value. The word originally referred to a small Spanish coin used in the American South and later developed its figurative sense of something small or trifling. Today, you might use it to describe a minor complaint or petty concern. In other words, if it's picayune, it's probably not worth making a big deal about.
Example: Why squabble over such picayune details when we have much bigger problems to solve?
