They say nobody is perfect and you believe it. Then you come across the perfectionists! There is only one way of dealing them - do as they say. Anything else would only mean inviting trouble. In fact, they are like super-humans who only want to defy all rules of imperfection. In other words, stay perfect all the time! Who does that? As their friend, you feel helpless and annoyed, and hope that someday they'll learn to take it easy.
For your friend, parallel parking and almost parallel are as distinct as apples and grapes.