Demanding meaning is reasonably tricky to comprehend. It refers to someone who is extremely selective and critical. A persnickety individual usually pay strict attention to detail and does not settle for less when it comes to expectations and perfection. Their meticulousness can be viewed as laudable, but it can also lead to overly demanding censure and unjustified dissatisfaction. Being persnickety is typically related to thorough attention to detail but can also be seen as a manifestation of perfectionism.
Persnickety definition in American English