Impertinent persons are individuals who are rude or disrespectful in their behavior. SNIPS are a type of sharp scissors used for cutting fabric, paper, hair, and other materials. The term 'SNIPS' is often used to describe someone who speaks or acts in an impolite manner. Therefore, the crossword solution of 'SNIPS' for the term 'impertinent persons' is an apt description of those who are rude or disrespectful.