A person who only prefer the perfect, instead of any standard short of perfection, most likely showing favoritism towards others.
Teacher: Ben, you got a 50/100! It means you pass!
Ben: YES!!!!!!!!
Teacher: Just kidding! The passing score is 200000000000/100
Ben: OH WHAT THE FUCK?!?!?!?!?!?!?!?!?!?!
Tim: That fucking perfectionist!!!!!!!!!!!!!!!!!!!!!!!!!